[llvm] [VPlan] Implement interleaving as VPlan-to-VPlan transform. (PR #95842)

[via llvm-commits]

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@@ -3476,10 +3476,7 @@ void InnerLoopVectorizer::fixFixedOrderRecurrence(VPLiveOut *LO,
   // initial value for the recurrence when jumping to the scalar loop.
   VPValue *VPExtract = LO->getOperand(0);
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ayalz wrote:

Should this still be called "Extract" given that the assert for ExtractFromEnd is dropped, or simply 
`VPExtract` >> `VPLastElement`,
`// Extract the last vector element ...` >> `// Retrieve the last vector element ...`
? 

https://github.com/llvm/llvm-project/pull/95842