[llvm] [InstSimplify] Add constant folding support for `ucmp`/`scmp` intrinsics (PR #93730)

[Nikita Popov via llvm-commits]

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nikic wrote:

In this case, I'd suggest adding explicit lt/gt/eq cases for both ucmp and scmp (six tests) rather than only covering a subset.

https://github.com/llvm/llvm-project/pull/93730