[llvm] [InstCombine] Relax one-use requirement for add iN (sext i1 X), (sext i1 Y) --> sext (X | Y) to iN (PR #90509)

[Nikita Popov via llvm-commits]

nikic wrote:

@goldsteinn That range also contains other commits. The regression is mostly https://github.com/llvm/llvm-project/pull/96851.

https://github.com/llvm/llvm-project/pull/90509