[llvm] [SLP]Improve reordering for consts, splats and ops from same nodes + improved analysis. (PR #87091)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

I will double-check if something can be improved. Without. this check there are other regressions.

https://github.com/llvm/llvm-project/pull/87091