[llvm] [InstCombine] Use the select condition to try to constant fold binops into select (PR #84696)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

This PR seems to be doing multiple things at the same time. Can you please split this up, and for example first only do the multi-use relaxation for div of select by constant rhs, before layering more things on top of it?

https://github.com/llvm/llvm-project/pull/84696