[llvm] [InstCombine] Fold one shifted by a boolean value (PR #207930)

[Jaeuk Lee via llvm-commits]

skku970412 wrote:

I have read the LLVM contribution policies linked above, including the LLVM AI Tool Use Policy and the InstCombine Contributor Guide. AI tool usage has been disclosed in the PR description, and I manually reviewed the implementation and tests before submission.

https://github.com/llvm/llvm-project/pull/207930