[llvm] [VPlan] Update scalar induction resume values in VPlan. (PR #110577)

[via llvm-commits]

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@@ -2676,13 +2680,14 @@ void InnerLoopVectorizer::createInductionResumeValues(
   // iteration in the vectorized loop.
   // If we come from a bypass edge then we need to start from the original
   // start value.
+  VPBasicBlock *ScalarPHVPBB = Plan.getScalarPreheader();
+  VPBuilder ScalarPHBuilder(ScalarPHVPBB, ScalarPHVPBB->begin());
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ayalz wrote:

In the long-term roadmap, it may be better to update eveny ResumePhi of the scalar preheader when each bypass block is introduced, to keep this introduction atomic, keeping control-flow predecessors up-to-date with data-flow phi's.

https://github.com/llvm/llvm-project/pull/110577