This is a follow-up to r320128. Eli pointed out that there is some gray area in the language standard about whether the constant size is exact, or a lower bound. https://reviews.llvm.org/D40940 llvm-svn: 320185
Teach UBSan's bounds check to opportunistically use pass_object_size information to check array accesses. rdar://33272922 llvm-svn: 320128