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

[Elvis Wang via llvm-commits]

ElvisWang123 wrote:

Update to recipe based implementation.

Note that the EVL version is not implement yet, so the test case in the RISCV changed.

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