[llvm] [InstCombine] Improve select simplification based on known bits (PR #97289)

[Nikita Popov via llvm-commits]

nikic wrote:

Unfortunately https://github.com/llvm/llvm-project/pull/110836 did not fix all regressions here. For example this one still exists: https://alive2.llvm.org/ce/z/vQxX3c

https://github.com/llvm/llvm-project/pull/97289