[compiler-rt] [compiler-rt] [Darwin] libFuzzer tests should use darwin_filter_host_archs (PR #160578)

[Dan Blackwell via llvm-commits]

https://github.com/DanBlackwell approved this pull request.

Please check the `endforeach()` indentation is correct, otherwise LGTM

https://github.com/llvm/llvm-project/pull/160578