[llvm] [VPlan] Introduce ExplicitVectorLengthMask recipe for EVL vectorization. (PR #95368)

[Mel Chen via llvm-commits]

Mel-Chen wrote:

Close this because we currently don't need it. The out-loop reduction issue can be addressed by transforming `VPInstruction::Select`.

https://github.com/llvm/llvm-project/pull/95368