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

[Hamza Hassanain via llvm-commits]

HamzaHassanain 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 ? 

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