[llvm] [TargetLowering] Deduplicate choosing InlineAsm constraint between ISels (PR #67057)

[Nick Desaulniers via llvm-commits]

nickdesaulniers wrote:

> > Given a list of constraints for InlineAsm (ex. "imr") I'm looking to modify the order in which is chosen.
> 
> "in which is chosen" - are you missing some words here?

maybe `s/in/of/`? I can reword this in the bottom commit just before merging.

https://github.com/llvm/llvm-project/pull/67057