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

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

I will merge this pull request after this patch passes all regression tests on my machine (I cannot rerun the failed workflow on buildkite).
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https://github.com/llvm/llvm-project/pull/65728