[llvm] [InstCombine] Fold reconstruction across select (PR #145102)

[Yingwei Zheng via llvm-commits]

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

Miscompilation reproducer: https://alive2.llvm.org/ce/z/qu9FYr

https://github.com/llvm/llvm-project/pull/145102