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

[David Green via llvm-commits]

https://github.com/davemgreen commented:

The test now all pass just fine and the MVE improvements are still present. Thanks for the fix.

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