[llvm] [LV] Bundle partial reductions inside VPExpressionRecipe (PR #147302)

[Sam Tebbs via llvm-commits]

SamTebbs33 wrote:

I've made a PR for bundling reductions with multiplies of a constant here: https://github.com/llvm/llvm-project/pull/162503

https://github.com/llvm/llvm-project/pull/147302