[llvm] [CodeGen] Avoid sinking vector comparisons during CodeGenPrepare (PR #113158)

[David Sherwood via llvm-commits]

david-arm wrote:

Hi @davemgreen, I will also add a proper test for MVE similar to the one I added because I realised the existing Thumb2 test changes are for tail-folded loops, which is probably a bit different.

https://github.com/llvm/llvm-project/pull/113158