diff --git a/clang/test/Analysis/crash-trace.c b/clang/test/Analysis/crash-trace.c
index ef1763ef97a5..0c8c8cc6cb2e 100644
--- a/clang/test/Analysis/crash-trace.c
+++ b/clang/test/Analysis/crash-trace.c
@@ -1,9 +1,8 @@
 // RUN: not --crash %clang_analyze_cc1 -analyzer-checker=debug.ExprInspection %s 2>&1 | FileCheck %s
 // REQUIRES: crash-recovery
 
-// FIXME: CHECKs might be incompatible to win32.
-// Stack traces also require back traces.
-// REQUIRES: shell, backtrace
+// Stack traces require back traces.
+// REQUIRES: backtrace
 
 void clang_analyzer_crash(void);
 
@@ -18,6 +17,6 @@ void test() {
 // CHECK: 0.	Program arguments: {{.*}}clang
 // CHECK-NEXT: 1.	<eof> parser at end of file
 // CHECK-NEXT: 2. While analyzing stack: 
-// CHECK-NEXT:  #0 Calling inlined at line 15
+// CHECK-NEXT:  #0 Calling inlined at line 14
 // CHECK-NEXT:  #1 Calling test
 // CHECK-NEXT: 3.	{{.*}}crash-trace.c:{{[0-9]+}}:3: Error evaluating statement
diff --git a/clang/test/CodeGen/thinlto_backend.ll b/clang/test/CodeGen/thinlto_backend.ll
index 2dd919d5f7de..fcfc7ea46657 100644
--- a/clang/test/CodeGen/thinlto_backend.ll
+++ b/clang/test/CodeGen/thinlto_backend.ll
@@ -1,5 +1,4 @@
-; shell required since the windows bot does not like the "(cd ..."
-; REQUIRES: x86-registered-target, shell
+; REQUIRES: x86-registered-target
 
 ; RUN: opt -module-summary -o %t1.o %s
 ; RUN: opt -module-summary -o %t2.o %S/Inputs/thinlto_backend.ll
@@ -32,10 +31,14 @@
 ; RUN: %clang -target x86_64-unknown-linux-gnu -O2 -o %t3.o -x ir %t1.o -c -fthinlto-index=%t.thinlto.bc -save-temps=obj
 ; RUN: llvm-dis %t1.s.3.import.bc -o - | FileCheck --check-prefix=CHECK-IMPORT %s
 ; RUN: mkdir -p %T/dir1
-; RUN: (cd %T/dir1 && %clang -target x86_64-unknown-linux-gnu -O2 -o %t3.o -x ir %t1.o -c -fthinlto-index=%t.thinlto.bc -save-temps=cwd)
+; RUN: cd %T/dir1
+; RUN: %clang -target x86_64-unknown-linux-gnu -O2 -o %t3.o -x ir %t1.o -c -fthinlto-index=%t.thinlto.bc -save-temps=cwd
+; RUN: cd ../..
 ; RUN: llvm-dis %T/dir1/*1.s.3.import.bc -o - | FileCheck --check-prefix=CHECK-IMPORT %s
 ; RUN: mkdir -p %T/dir2
-; RUN: (cd %T/dir2 && %clang -target x86_64-unknown-linux-gnu -O2 -o %t3.o -x ir %t1.o -c -fthinlto-index=%t.thinlto.bc -save-temps)
+; RUN: cd %T/dir2
+; RUN: %clang -target x86_64-unknown-linux-gnu -O2 -o %t3.o -x ir %t1.o -c -fthinlto-index=%t.thinlto.bc -save-temps
+; RUN: cd ../..
 ; RUN: llvm-dis %T/dir2/*1.s.3.import.bc -o - | FileCheck --check-prefix=CHECK-IMPORT %s
 ; CHECK-IMPORT: define available_externally void @f2()
 ; RUN: llvm-nm %t3.o | FileCheck --check-prefix=CHECK-OBJ %s
diff --git a/clang/test/Driver/check-time-trace-sections.cpp b/clang/test/Driver/check-time-trace-sections.cpp
index 4d1c0fde3a8c..2dbe2037550a 100644
--- a/clang/test/Driver/check-time-trace-sections.cpp
+++ b/clang/test/Driver/check-time-trace-sections.cpp
@@ -1,4 +1,3 @@
-// REQUIRES: shell
 // RUN: %clangxx -S -ftime-trace -ftime-trace-granularity=0 -o %T/check-time-trace-sections %s
 // RUN: cat %T/check-time-trace-sections.json | %python %S/check-time-trace-sections.py
 
diff --git a/clang/test/Driver/check-time-trace.cpp b/clang/test/Driver/check-time-trace.cpp
index 9d381786b187..3c6a002ae8ab 100644
--- a/clang/test/Driver/check-time-trace.cpp
+++ b/clang/test/Driver/check-time-trace.cpp
@@ -1,4 +1,3 @@
-// REQUIRES: shell
 // RUN: %clangxx -S -ftime-trace -ftime-trace-granularity=0 -o %T/check-time-trace %s
 // RUN: cat %T/check-time-trace.json \
 // RUN:   | %python -c 'import json, sys; json.dump(json.loads(sys.stdin.read()), sys.stdout, sort_keys=True, indent=2)' \
diff --git a/clang/test/Driver/clang-offload-bundler.c b/clang/test/Driver/clang-offload-bundler.c
index 44366920fe25..be17b092ef34 100644
--- a/clang/test/Driver/clang-offload-bundler.c
+++ b/clang/test/Driver/clang-offload-bundler.c
@@ -1,7 +1,6 @@
 // REQUIRES: x86-registered-target
 // REQUIRES: powerpc-registered-target
-// REQUIRES: shell
-// UNSUPPORTED: ms-sdk, darwin
+// UNSUPPORTED: darwin
 
 //
 // Generate all the types of files we can bundle.
diff --git a/clang/test/Driver/crash-report-crashfile.m b/clang/test/Driver/crash-report-crashfile.m
index fbfb532703ef..bdfac327516f 100644
--- a/clang/test/Driver/crash-report-crashfile.m
+++ b/clang/test/Driver/crash-report-crashfile.m
@@ -1,4 +1,4 @@
-// REQUIRES: crash-recovery, shell, system-darwin
+// REQUIRES: crash-recovery, system-darwin
 // RUN: rm -rf %t
 // RUN: mkdir -p %t/i %t/m %t
 
diff --git a/clang/test/Driver/rewrite-map-in-diagnostics.c b/clang/test/Driver/rewrite-map-in-diagnostics.c
index 4aea0ec03145..7c5811539ef1 100644
--- a/clang/test/Driver/rewrite-map-in-diagnostics.c
+++ b/clang/test/Driver/rewrite-map-in-diagnostics.c
@@ -9,6 +9,3 @@
 // CHECK: note: diagnostic msg: {{.*}}rewrite.map
 
 // REQUIRES: crash-recovery
-
-// FIXME: This doesn't fail on "env clang". Investigating.
-// REQUIRES: shell
diff --git a/clang/test/Format/style-on-command-line.cpp b/clang/test/Format/style-on-command-line.cpp
index 0e6078e2fd67..ba06babee35a 100644
--- a/clang/test/Format/style-on-command-line.cpp
+++ b/clang/test/Format/style-on-command-line.cpp
@@ -39,4 +39,4 @@ int j;
 
 // On Windows, the 'rm' commands fail when the previous process is still alive.
 // This happens enough to make the test useless.
-// REQUIRES: shell
+// UNSUPPORTED: system-windows
diff --git a/clang/test/Frontend/dependency-gen-has-include.c b/clang/test/Frontend/dependency-gen-has-include.c
index e8abb2c9c163..51de72a5a0fb 100644
--- a/clang/test/Frontend/dependency-gen-has-include.c
+++ b/clang/test/Frontend/dependency-gen-has-include.c
@@ -1,5 +1,3 @@
-// REQUIRES: shell
-
 // Basic test
 // RUN: rm -rf %t.dir
 // RUN: mkdir %t.dir
@@ -19,16 +17,16 @@
 // RUN: FileCheck -input-file=%t.dir/file.deps %s
 // CHECK: dependency-gen-has-include.o
 // CHECK: dependency-gen-has-include.c
-// CHECK: a/header.h
-// CHECK-NOT: missing/file.h
-// CHECK: system/system-header.h
-// CHECK: next-a/next-header.h
-// CHECK: next-b/next-header.h
+// CHECK: a{{[/\\]}}header.h
+// CHECK-NOT: missing{{[/\\]}}file.h
+// CHECK: system{{[/\\]}}system-header.h
+// CHECK: next-a{{[/\\]}}next-header.h
+// CHECK: next-b{{[/\\]}}next-header.h
 
 // Verify that we ignore system headers in user-only headers mode.
 // RUN: %clang -MMD -MF %t.dir/user-headers.deps %s -fsyntax-only -I %t.dir -isystem %t.dir/system -I %t.dir/next-a -I %t.dir/next-b
 // RUN: FileCheck -input-file=%t.dir/user-headers.deps --check-prefix CHECK-USER-HEADER %s
-// CHECK-USER-HEADER-NOT: system/system-header.h
+// CHECK-USER-HEADER-NOT: system{{[/\\]}}system-header.h
 
 #if __has_include("a/header.h")
 #endif
diff --git a/clang/test/Index/crash-recovery-modules.m b/clang/test/Index/crash-recovery-modules.m
index 296416df97f2..dab71edd2906 100644
--- a/clang/test/Index/crash-recovery-modules.m
+++ b/clang/test/Index/crash-recovery-modules.m
@@ -4,14 +4,13 @@
 // Parse the file, such that building the module will cause Clang to crash.
 // RUN: not env CINDEXTEST_FAILONERROR=1 c-index-test -test-load-source all -fmodules -fmodules-cache-path=%t -Xclang -fdisable-module-hash -I %S/Inputs/Headers -DCRASH %s > /dev/null 2> %t.err
 // RUN: FileCheck < %t.err -check-prefix=CHECK-CRASH %s
-// CHECK-CRASH: crash-recovery-modules.m:17:9:{17:2-17:14}: fatal error: could not build module 'Crash'
+// CHECK-CRASH: crash-recovery-modules.m:16:9:{16:2-16:14}: fatal error: could not build module 'Crash'
 
 // Parse the file again, without crashing, to make sure that
 // subsequent parses do the right thing.
 // RUN: env CINDEXTEST_FAILONERROR=1 c-index-test -test-load-source all -fmodules -fmodules-cache-path=%t -Xclang -fdisable-module-hash -I %S/Inputs/Headers %s > /dev/null
 
 // REQUIRES: crash-recovery
-// REQUIRES: shell
 // UNSUPPORTED: libstdcxx-safe-mode
 
 @import Crash;
diff --git a/clang/test/Modules/at-import-in-framework-header.m b/clang/test/Modules/at-import-in-framework-header.m
index fe3663812075..043c69462edf 100644
--- a/clang/test/Modules/at-import-in-framework-header.m
+++ b/clang/test/Modules/at-import-in-framework-header.m
@@ -1,5 +1,3 @@
-// REQUIRES: shell
-
 // RUN: rm -rf %t
 // RUN: mkdir %t
 
diff --git a/clang/test/Modules/builtins.m b/clang/test/Modules/builtins.m
index 88a44e7b0aa3..2480e6379cc8 100644
--- a/clang/test/Modules/builtins.m
+++ b/clang/test/Modules/builtins.m
@@ -8,7 +8,6 @@
 // RUN: %clang_cc1 -fmodules-cache-path=%t.pch.cache -fmodules -fimplicit-module-maps -I %S/Inputs %s -include-pch %t.pch %s -verify
 
 // expected-no-diagnostics
-// REQUIRES: shell
 
 void use_constant_string_builtins1(void) {
   (void)__builtin___CFStringMakeConstantString("");
diff --git a/clang/test/Modules/dependency-dump-dependent-module.m b/clang/test/Modules/dependency-dump-dependent-module.m
index 490698616546..2430726d3ae5 100644
--- a/clang/test/Modules/dependency-dump-dependent-module.m
+++ b/clang/test/Modules/dependency-dump-dependent-module.m
@@ -1,8 +1,6 @@
 // When a module depends on another, check that we dump the dependency header
 // files for both.
 
-// REQUIRES: shell
-
 // RUN: rm -rf %t
 // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/cache -module-dependency-dir %t/vfs -F %S/Inputs -I %S/Inputs -verify %s
 // expected-no-diagnostics
diff --git a/clang/test/Modules/dependency-dump.m b/clang/test/Modules/dependency-dump.m
index deb66188e147..f3a487544b8e 100644
--- a/clang/test/Modules/dependency-dump.m
+++ b/clang/test/Modules/dependency-dump.m
@@ -1,8 +1,6 @@
 // Check that we can dump all of the headers a module depends on, and a VFS map
 // for the same.
 
-// REQUIRES: shell
-
 // RUN: rm -rf %t
 // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/cache -module-dependency-dir %t/vfs -F %S/Inputs -I %S/Inputs -verify %s
 // expected-no-diagnostics
diff --git a/clang/test/Modules/implicit-invalidate-common.c b/clang/test/Modules/implicit-invalidate-common.c
index d6cf90e12dc3..143a00ff37a8 100644
--- a/clang/test/Modules/implicit-invalidate-common.c
+++ b/clang/test/Modules/implicit-invalidate-common.c
@@ -1,4 +1,3 @@
-// REQUIRES: shell
 // RUN: rm -rf %t
 // RUN: mkdir -p %t/implicit-invalidate-common
 // RUN: cp -r %S/Inputs/implicit-invalidate-common %t/
diff --git a/clang/test/OpenMP/task_firstprivate_codegen.cpp b/clang/test/OpenMP/task_firstprivate_codegen.cpp
index 0517ec145be5..e9c6d6d73852 100644
--- a/clang/test/OpenMP/task_firstprivate_codegen.cpp
+++ b/clang/test/OpenMP/task_firstprivate_codegen.cpp
@@ -13,8 +13,6 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -std=c++11 -DARRAY -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck --check-prefix SIMD-ONLY0 %s
 // SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
 // expected-no-diagnostics
-// It doesn't pass on win32.
-// REQUIRES: shell
 #ifndef ARRAY
 #ifndef HEADER
 #define HEADER
diff --git a/clang/test/OpenMP/task_private_codegen.cpp b/clang/test/OpenMP/task_private_codegen.cpp
index 17b0de16a1c3..32303cd600a7 100644
--- a/clang/test/OpenMP/task_private_codegen.cpp
+++ b/clang/test/OpenMP/task_private_codegen.cpp
@@ -13,8 +13,6 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -std=c++11 -DARRAY -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck --check-prefix SIMD-ONLY0 %s
 // SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
 // expected-no-diagnostics
-// It doesn't pass on win32. Investigating.
-// REQUIRES: shell
 
 #ifndef ARRAY
 #ifndef HEADER
diff --git a/clang/test/OpenMP/taskloop_firstprivate_codegen.cpp b/clang/test/OpenMP/taskloop_firstprivate_codegen.cpp
index 0aa9f3e6966a..64723814abb5 100644
--- a/clang/test/OpenMP/taskloop_firstprivate_codegen.cpp
+++ b/clang/test/OpenMP/taskloop_firstprivate_codegen.cpp
@@ -13,8 +13,7 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -std=c++11 -DARRAY -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck --check-prefix SIMD-ONLY0 %s
 // SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
 // expected-no-diagnostics
-// It doesn't pass on win32.
-// REQUIRES: shell
+
 #ifndef ARRAY
 #ifndef HEADER
 #define HEADER
diff --git a/clang/test/OpenMP/taskloop_lastprivate_codegen.cpp b/clang/test/OpenMP/taskloop_lastprivate_codegen.cpp
index 6e6588571103..1df56ac9fdae 100644
--- a/clang/test/OpenMP/taskloop_lastprivate_codegen.cpp
+++ b/clang/test/OpenMP/taskloop_lastprivate_codegen.cpp
@@ -15,8 +15,7 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -std=c++11 -DLOOP -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck -check-prefix=SIMD-ONLY0 %s
 // SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
 // expected-no-diagnostics
-// It doesn't pass on win32.
-// REQUIRES: shell
+
 #if !defined(ARRAY) && !defined(LOOP)
 #ifndef HEADER
 #define HEADER
diff --git a/clang/test/OpenMP/taskloop_private_codegen.cpp b/clang/test/OpenMP/taskloop_private_codegen.cpp
index c7a85a4661a0..01c387e95d7e 100644
--- a/clang/test/OpenMP/taskloop_private_codegen.cpp
+++ b/clang/test/OpenMP/taskloop_private_codegen.cpp
@@ -13,8 +13,6 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -std=c++11 -DARRAY -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck --check-prefix SIMD-ONLY0 %s
 // SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
 // expected-no-diagnostics
-// It doesn't pass on win32. Investigating.
-// REQUIRES: shell
 
 #ifndef ARRAY
 #ifndef HEADER
diff --git a/clang/test/OpenMP/taskloop_simd_firstprivate_codegen.cpp b/clang/test/OpenMP/taskloop_simd_firstprivate_codegen.cpp
index 5f0b5dea1f9e..935aacc77b59 100644
--- a/clang/test/OpenMP/taskloop_simd_firstprivate_codegen.cpp
+++ b/clang/test/OpenMP/taskloop_simd_firstprivate_codegen.cpp
@@ -13,8 +13,7 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -std=c++11 -DARRAY -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck --check-prefix SIMD-ONLY0 %s
 // SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
 // expected-no-diagnostics
-// It doesn't pass on win32.
-// REQUIRES: shell
+
 #ifndef ARRAY
 #ifndef HEADER
 #define HEADER
diff --git a/clang/test/OpenMP/taskloop_simd_lastprivate_codegen.cpp b/clang/test/OpenMP/taskloop_simd_lastprivate_codegen.cpp
index 051c843e0a61..97007dde2f2b 100644
--- a/clang/test/OpenMP/taskloop_simd_lastprivate_codegen.cpp
+++ b/clang/test/OpenMP/taskloop_simd_lastprivate_codegen.cpp
@@ -13,8 +13,7 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -std=c++11 -DARRAY -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck --check-prefix SIMD-ONLY0 %s
 // SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
 // expected-no-diagnostics
-// It doesn't pass on win32.
-// REQUIRES: shell
+
 #ifndef ARRAY
 #ifndef HEADER
 #define HEADER
diff --git a/clang/test/OpenMP/taskloop_simd_private_codegen.cpp b/clang/test/OpenMP/taskloop_simd_private_codegen.cpp
index 2425d23dbaf1..29b9c8302be3 100644
--- a/clang/test/OpenMP/taskloop_simd_private_codegen.cpp
+++ b/clang/test/OpenMP/taskloop_simd_private_codegen.cpp
@@ -13,8 +13,6 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -std=c++11 -DARRAY -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck --check-prefix SIMD-ONLY0 %s
 // SIMD-ONLY0-NOT: {{__kmpc|__tgt}}
 // expected-no-diagnostics
-// It doesn't pass on win32. Investigating.
-// REQUIRES: shell
 
 #ifndef ARRAY
 #ifndef HEADER
diff --git a/clang/test/PCH/modified-header-error.c b/clang/test/PCH/modified-header-error.c
index 8ab38e1e9e98..fb638363ba65 100644
--- a/clang/test/PCH/modified-header-error.c
+++ b/clang/test/PCH/modified-header-error.c
@@ -9,4 +9,6 @@
 #include "header2.h"
 
 // CHECK: fatal error: file {{.*}} has been modified since the precompiled header {{.*}} was built
-// REQUIRES: shell
+
+// FIXME: Flaky on Windows, timestamp resolution?
+// UNSUPPORTED: win32
diff --git a/clang/test/Parser/crash-report.c b/clang/test/Parser/crash-report.c
index ef65b88a06e7..6ca10459d9a5 100644
--- a/clang/test/Parser/crash-report.c
+++ b/clang/test/Parser/crash-report.c
@@ -1,9 +1,8 @@
 // RUN: not --crash %clang_cc1 %s 2>&1 | FileCheck %s
 // REQUIRES: crash-recovery
 
-// FIXME: CHECKs might be incompatible to win32.
 // Stack traces also require back traces.
-// REQUIRES: shell, backtrace
+// REQUIRES: backtrace
 
 #prag\
 ma clang __debug crash