un-break remaining gdb buildbot testcases.
Make sure we do not generate line info for debugging-related frame setup.
Follow-up to r178361 / rdar://problem/12767564

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178517 91177308-0d34-0410-b5e6-96231b3b80d8