[compiler-rt] [ASan] Honor `allocator_may_return_null` when set through user-function and fix large alloc edge case (PR #117929)

[David Justo via llvm-commits]

davidmrdavid wrote:

Thanks @zmodem for the thorough review. I'm unable to merge this myself, I don't have commit access (I'd love to get there eventually). Can you help me merge this or what is the procedure at this point?

https://github.com/llvm/llvm-project/pull/117929