test/Sema/tls.c: don't use -verify to check if TLS is supported

Use "%clang_cc1" vs "not %clang_cc1" instead.
Also use -fsyntax-only.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161165 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed