[llvm] [InstCombine] Replace an integer comparison of a `phi` node with multiple `ucmp`/`scmp` operands and a constant with `phi` of individual comparisons of original intrinsic's arguments (PR #107769)

[Nikita Popov via llvm-commits]

================

----------------
nikic wrote:

Can you please also add negative tests where one scmp is not one-use or the icmp operand is not constant?

https://github.com/llvm/llvm-project/pull/107769