[clang] [compiler-rt] [Clang] Adjust pointer-overflow sanitizer for N3322 (PR #120719)

[Nikita Popov via llvm-commits]

nikic wrote:

@vitalybuka Should I also be dropping checks like https://github.com/llvm/llvm-project/blob/5f0db7c11264fa235d73730b2b93a31407dfbef3/compiler-rt/lib/ubsan/ubsan_handlers.cpp#L817-L818 from the ubsan runtime? (Not sure whether the runtime is supposed to also be compatible with older clang versions or something like that.)

https://github.com/llvm/llvm-project/pull/120719