[compiler-rt] [compiler-rt] fix gcc 12 support by removing enum-type-specifier (PR #165034)

[Mikołaj Piróg via llvm-commits]

mikolaj-pirog wrote:

Thanks @yuxuanchen1997 for pointing out that using typed enums is c23, I missed that. 

My goal with introducing the enum was to prevent errors like the one I fixed in the PR with CWF. I think we could keep the enum as an argument type, revert to unsigned int in the struct, and cast when calling the function. Would that be okay?

https://github.com/llvm/llvm-project/pull/165034