[libc] Fix gnu::naked and return-type errors with gcc on aarch64#120525

RossComputerGuy wants to merge 1 commit intollvm:mainllvm/llvm-project:mainfrom

RossComputerGuy:fix/libc-gnu-nakedRossComputerGuy/llvm-project:fix/libc-gnu-nakedCopy head branch name to clipboard