[llvm] [VPlan] Introduce ComputeReductionResult VPInstruction opcode. (PR #70253)

[via llvm-commits]

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@@ -347,10 +347,13 @@ class LoopVectorizationPlanner {
   /// vectorization re-using plans for both the main and epilogue vector loops.
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ayalz wrote:

nit: above "Generate the IR code for the body of the vectorized loop" is no longer accurate. Suggest to update with something like "Generate the IR code for the vectorized loop captured in VPlan"

https://github.com/llvm/llvm-project/pull/70253