Add a test case for r202888, which boiled down to -gline-tables-only

clang-cl defaults to -gline-tables-only, because that's the only
CodeView debug info that LLVM knows how to emit.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202891 91177308-0d34-0410-b5e6-96231b3b80d8