[llvm] [RISCV] Combine trunc (sra sext (X), zext (Y)) to sra (X, smin (Y, ScalarSizeInBits(Y) - 1)) (PR #65728)

[via llvm-commits]

LWenH wrote:

How to add reviewers like in phabricator to request for review in github? I can't find that button in github interfaces(I tried that in the right side "Reviewers" button but that button is not clickable, may be that need some permission in github?). 

@topperc @lukel97  
Request for review, thank you. 

https://github.com/llvm/llvm-project/pull/65728