[llvm] [ARM] Replace manual CLS expansion with ISD::CTLS (PR #178430)

[Craig Topper via llvm-commits]

topperc wrote:

> @topperc Hello! I am encountering so many issues on my machine right now, so I won't be able to continue working on this PR for now. If anyone can clone this branch and continue working on these minor issues, then go on.
> 
> OR should I close this PR ?

I'll take it.

https://github.com/llvm/llvm-project/pull/178430