[llvm] Add 3 way compare <=> integer intrinsics to Langref (PR #83227)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

For reference, a GlobalIsel PR that introduced new named opcodes and touched the IRTranslator.
https://github.com/llvm/llvm-project/pull/75086

https://github.com/llvm/llvm-project/pull/83227