[llvm] [SLP]Use TTI::getScalarizationOverhead where possible (PR #125725)

[Seunghoon Park via llvm-commits]

pclove1 wrote:

Hi @alexey-bataev,

I believe, unfortunately, this PR caused a performance regression, so filed #127244. Any chance this change can be reverted or fixed forward?

https://github.com/llvm/llvm-project/pull/125725