[PDB] Attempt fix for debug-info-codeview-buildinfo.c test

This is a bit a shot in the dark, as it doesn't occur on my Windows 10 machines, nor on x64 Linux Ubuntu 18.04.
This patch tries to fix the following kind of error:
- http://lab.llvm.org:8011/builders/clang-ppc64le-linux/builds/31511/steps/cmake%20stage%201/logs/stdio
- http://lab.llvm.org:8011/builders/clang-ppc64le-linux-lnt/builds/25150/steps/ninja%20check%201/logs/FAIL%3A%20Clang%3A%3Adebug-info-codeview-buildinfo.c
- http://lab.llvm.org:8011/builders/fuchsia-x86_64-linux/builds/7947/steps/check/logs/stdio

clang/cmake/caches/BaremetalARM.cmake

@@ -31,6 +31,7 @@ set(LLVM_TOOLCHAIN_TOOLS
   llvm-dwarfdump
   llvm-nm
   llvm-objdump
+  llvm-pdbutil
   llvm-ranlib
   llvm-readobj
   llvm-size

clang/cmake/caches/CrossWinToARMLinux.cmake

@@ -137,6 +137,7 @@ set(LLVM_TOOLCHAIN_TOOLS
   llvm-lib
   llvm-nm
   llvm-objdump
+  llvm-pdbutil
   llvm-profdata
   llvm-ranlib
   llvm-readobj

clang/cmake/caches/Fuchsia-stage2.cmake

@@ -240,6 +240,7 @@ set(LLVM_TOOLCHAIN_TOOLS
   llvm-nm
   llvm-objcopy
   llvm-objdump
+  llvm-pdbutil
   llvm-profdata
   llvm-ranlib
   llvm-readelf

clang/test/CMakeLists.txt

@@ -126,6 +126,7 @@ if( NOT CLANG_BUILT_STANDALONE )
     llvm-nm
     llvm-objcopy
     llvm-objdump
+    llvm-pdbutil
     llvm-profdata
     llvm-readelf
     llvm-readobj

clang/test/CodeGen/debug-info-codeview-buildinfo.c

@@ -1,7 +1,6 @@
-// UNSUPPORTED: s390x
-// RUN: %clang_cl /c /Z7 /Fo%t.obj -- %s
+// RUN: %clang_cl --target=i686-windows-msvc /c /Z7 /Fo%t.obj -- %s
 // RUN: llvm-pdbutil dump --types %t.obj | FileCheck %s
-// RUN: %clang_cl /c /Z7 /Fo%t.obj -fdebug-compilation-dir . -- %s
+// RUN: %clang_cl --target=i686-windows-msvc /c /Z7 /Fo%t.obj -fdebug-compilation-dir=. -- %s
 // RUN: llvm-pdbutil dump --types %t.obj | FileCheck %s --check-prefix RELATIVE
 
 int main() { return 42; }