clang/test/Driver/debug-options-as.c: Fixup not to use prefix=S. I didn't know "REQUIRES:" would match --check-prefix=S ...

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169826 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed