[llvm] Apply the `AdjustICmpImmAndPred` optimization when it results in a one-instruction immediate materialization over a two-instruction materialization. (PR #83218)

[David Green via llvm-commits]

davemgreen wrote:

It would be good if the title had [AArch64][GlobalISel] too, to keep in consistent with all the other commits. The title might be a bit long too for a standard git commit. Some of it might fit better as the message.

https://github.com/llvm/llvm-project/pull/83218