[libc-commits] [libc] [libc] fix -Wshorten-64-to-32 for 32b arm mmap (PR #77350)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

alternately, we could just check for `__arm__`.  Thoughts?

https://github.com/llvm/llvm-project/pull/77350