[llvm] [RISCV] Combine trunc (sra sext (x), zext (y)) to sra (x, smin (y, scalarsizeinbits(y) - 1)) (PR #65728)

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LWenH wrote:

![image](https://github.com/llvm/llvm-project/assets/39164871/fad6da41-6169-42b7-b6c9-d9bc01664ad7)
Hi, folks.  I might still not have the write access to the github repository.  Could reviewers merge this pull request for me please? BTW, I want to know how to get the write access for the github repository now？I didn't see the similar description in the new version of the [github submission instructions](https://llvm.org/docs/GitHub.html#github-reviews).  May be also need that write access to get the permission to add reviewers for pull requests in github right now? 

Thank you for your time to read this question.

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