[llvm] [VPlan] Manage Sentinel value for FindLastIV in VPlan. (PR #142291)

[via llvm-commits]

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@@ -9825,8 +9829,8 @@ preparePlanForEpilogueVectorLoop(VPlan &Plan, Loop *L,
         BasicBlock *ResumeBB = cast<Instruction>(ResumeV)->getParent();
         IRBuilder<> Builder(ResumeBB, ResumeBB->getFirstNonPHIIt());
         Value *Cmp = Builder.CreateICmpEQ(ResumeV, ToFrozen[StartV]);
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ayalz wrote:

`Value *Sentinel = ...`

https://github.com/llvm/llvm-project/pull/142291