Don't run optimizations in a clang test.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189880 91177308-0d34-0410-b5e6-96231b3b80d8
clang-cl: Make -W a core option so we can adjust clang warnings.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189882 91177308-0d34-0410-b5e6-96231b3b80d8
Use -O0 in this test too.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189884 91177308-0d34-0410-b5e6-96231b3b80d8
Fix the test on -Asserts build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189888 91177308-0d34-0410-b5e6-96231b3b80d8