[clang] [Driver] Restore compiler-rt arch suffix for PS and Windows (PR #89775)

[Tobias Hieta via cfe-commits]

tru wrote:

I think I suggested that we should make the CMake variable change the driver behaviour to reflect the setting in order to remove unexpected fallbacks and that the vendor could select the layout. I still think that's probably the better solution. 

https://github.com/llvm/llvm-project/pull/89775