[compiler-rt] [PAC][compiler-rt] Do not use `__has_feature` with non-clang (PR #102154)

[Piotr Sobczak via llvm-commits]

piotrAMD wrote:

Looks another fix was submitted instead 41b83ca559c402d238e303c0ac233180d60dcd57 - I wasn't aware of that when I raised the issue.

https://github.com/llvm/llvm-project/pull/102154