[llvm] [AArch64] Reorder Comparison Trees to Facilitate CSE (PR #168064)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

I was a little sceptical as sometimes it is better to perform lots of little transforms, canEmitConjunction/emitConjunctionRec tries to do everything all at once. But this appears to work OK.

LGTM.

https://github.com/llvm/llvm-project/pull/168064