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

zmodem merged 9 commits intollvm:mainllvm/llvm-project:mainfrom

davidmrdavid:dev/dajusto/honor-allocator-may-return-null-under-large-mallocsdavidmrdavid/llvm-project:dev/dajusto/honor-allocator-may-return-null-under-large-mallocsCopy head branch name to clipboard