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

[Tobias Hieta via cfe-commits]

tru wrote:

I don't have the bandwidth to get a RFC through right now. If this is broken and no-one wants to take care of getting consensus for something new, I suggest you revert to the previous state. For my toolchain I can continue to carry a patch until this is all sorted.

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