[llvm] [InstCombine] Fold trunc(lshr(add(shl(X, ShAmt), C), ShrAmt)) (PR #214562)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw requested changes to this pull request.

A correctness issue was identified by [llvm-hackme](https://github.com/dtcxzyw/llvm-hackme). Please see the [issue comment](https://github.com/llvm/llvm-project/pull/214562#issuecomment-5250622004) for details.

https://github.com/llvm/llvm-project/pull/214562