UBSan: enable proper linking with UBsan runtime on Darwin. Turn on building ubsan on OS X in 'make' build system. Patch by Jean-Daniel Dupas.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@168168 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed