[llvm] [InstCombine] Fold select of and/or subset identity to `or` (PR #209072)

[Joel Walker via llvm-commits]

Joel-Wwalker wrote:

Confirmed - I've read the LLVM contribution policies, including the AI Tool Use Policy and the InstCombine Contributor Guide. AI assistance (Claude) is noted in the PR description.

https://github.com/llvm/llvm-project/pull/209072