[PATCH] D34121: [ubsan] Teach the pointer overflow check that "p - <unsigned> <= p" (PR33430)

[Vedant Kumar via Phabricator via cfe-commits]

vsk added a comment.

@dtzWill do you have any further comments on this one?

I'd like to get another 'lgtm' before committing, and it'd be nice to get this in before llvm 5.0 branches (7/19).

FWIW we've been living on this for a few weeks internally without any issues:
https://github.com/apple/swift-clang/commit/3ebe7d87b9d545aebdd80452d0b79695ff871bce


https://reviews.llvm.org/D34121