[llvm] [AArch64][FEAT_CMPBR] Codegen for Armv9.6-a compare-and-branch (PR #116465)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Could this be done without introducing new pseudo instructions? They often have a higher cost than you would expect and I'm not sure it makes sense to define the instructions in the way they are currently specified.

https://github.com/llvm/llvm-project/pull/116465