[llvm] [MachineLICM] Give opportunity to analyze physregs for invariance. (PR #84779)

[Stanislav Mekhanoshin via llvm-commits]

https://github.com/rampitec commented:

This looks reasonable, but isn't it the same as `isIgnorableUse`? Or do you need this because you want hoisting but still want to prevent rematerialization?

https://github.com/llvm/llvm-project/pull/84779