[llvm] [VPlan] Impl VPlan-based pattern match for ExtendedRed and MulAccRed (PR #113903)

[Elvis Wang via llvm-commits]

ElvisWang123 wrote:

Split new recipes implementations to #137745.
Split transformations (convertTo{Abstract|Concrete}Recipes) to #137746.

Will update this patch after above patches landed.
This patch will focus on removing the dependency of the legacy cost model and enable this transformation by VPlan-based cost model.

https://github.com/llvm/llvm-project/pull/113903