[NewPM] Run ubsan-coroutines test under the legacy pass manager only

The passes that lower the llvm.coro.* instrinsics have not yet been ported,
so only run under the legacy PM for now.

See https://bugs.llvm.org/show_bug.cgi?id=42867

Differential Revision: https://reviews.llvm.org/D66493

llvm-svn: 369442

clang/test/CodeGenCXX/ubsan-coroutines.cpp

@@ -1,6 +1,8 @@
 // This test merely verifies that emitting the object file does not cause a
 // crash when the LLVM coroutines passes are run.
-// RUN: %clang_cc1 -emit-obj -std=c++2a -fsanitize=null %s -o %t.o
+// PR42867: Disable this test for the new PM since the passes that lower the
+// llvm.coro.* intrinsics have not yet been ported.
+// RUN: %clang_cc1 -fno-experimental-new-pass-manager -emit-obj -std=c++2a -fsanitize=null %s -o %t.o
 
 namespace std::experimental {
 template <typename R, typename... T> struct coroutine_traits {