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

[Tobias Hieta via cfe-commits]

tru wrote:

Honestly - I think going back to *one* style of runtime path is to be preferred now. But I don't think it's fair to say that it doesn't solve any problems, because we switched to it so that we could ship more platforms in one toolchain package without having to add cfg files and similar things to point it to the right path. There was some kind of collision we ran into when we where using the old path.

I do think the current status quo is confusing and bad, so I rather we go back to the old layout if that's what people prefer and I'll have to work around that in that case. But it sounds like this needs a RFC.

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