[llvm] [AArch64] recognise zip1/zip2 with flipped operands (PR #167235)

[Philip Ginsbach-Chen via llvm-commits]

ginsbach wrote:

> I do not have commit access. Please, could you go ahead and merge this for me?

Please, could somebody merge this for me? @davemgreen @MacDue @nasherm 

https://github.com/llvm/llvm-project/pull/167235