[clang] [llvm] [Driver] Add option to select compiler-rt arch suffix (PR #89775)

[Tobias Hieta via cfe-commits]

tru wrote:

Yeah I think this should be brought up as an RFC in discourse. I would like to see that we move away from two different layouts and just adopt one (my preference is the new layout, but honestly - I don't feel that strongly about it).

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