Use -fno-limit-debug-info instead of -fstandalone-debug in tests

This fixes tests on clang-3.4

AFAICT, these flags have the same affect and -fstandalone-debug wasn't
added until after clang-3.4

Committed to try to fix buildbot

Differential Revision: http://reviews.llvm.org/D8347

llvm-svn: 232326