[llvm] remove 'movt' if there is no user of it (PR #136735)

[via llvm-commits]

BaoshanPang wrote:

I don't know how to create a end to end test case yet . Is there an example I can check with?
> Do you have an end to end change where this makes an observable difference? That would be a useful testcase. 
> 
> 



https://github.com/llvm/llvm-project/pull/136735