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

[Nico Weber via cfe-commits]

nico wrote:

> Again, clangDriver does file probing in various places.

This is the only place where we probe link-time inputs for compile-time decisions as far as I know.

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