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

[Paul T Robinson via cfe-commits]

pogo59 wrote:

Microsoft obviously builds and distributes with the arch suffix, supporting both 32-bit and 64-bit in the same distro. So I think they will continue to need it. (I can't actually speak for MS, but it's what I see in the Visual Studio installation.)

I don't know enough about how distros work to say what's needed here. Some sort of CMAKE variable I suppose. Then we and MS will set it up one way, and you will set it up the other way. Do you have a concrete suggestion?

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