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

[David Green via llvm-commits]

davemgreen wrote:

MVE has only a single vector predicate register available, so it might be better to do the sinking. Could you add a test case to check if it looks better?

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