[compiler-rt] [compiler-rt][rtsan] intercept accept4 syscall. (PR #117278)

[Chris Apple via llvm-commits]

cjappl wrote:

@devnexen Thanks for the contribution. If you do any future work on rtsan please add me as a reviewer if you want eyes on it, otherwise I may miss it.

https://github.com/llvm/llvm-project/pull/117278