[compiler-rt] [Darwin][CompilerRT] Set compiler ID to 'Clang' for Compiler RT Tests for Apple Clang (PR #121858)

[Mariusz Borsa via llvm-commits]

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

Looks good, and we got an agreement in the discussion

https://github.com/llvm/llvm-project/pull/121858