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

[via llvm-commits]

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@@ -664,6 +678,12 @@ class InnerLoopVectorizer {
   /// for cleaning the checks, if vectorization turns out unprofitable.
   GeneratedRTChecks &RTChecks;
 
+  /// Mapping of induction phis to their bypass values and bypass blocks. They
+  /// need to be added as operands to phi nodes in the scalar loop preheader
+  /// after the epilogue skeleton has been created.
+  DenseMap<PHINode *, std::pair<BasicBlock *, Value *>>
+      Induction2AdditionalBypass;
+
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ayalz wrote:

```suggestion
  /// The additional bypass block which conditionally skips over the epilog loop after executing the main loop. Needed to resume inductions and reductions during epilog vectorization.
  BasicBlock *AdditionalBypassBlock;
  
  /// Mapping of induction phis to their additional bypass values. They
  /// need to be added as operands to phi nodes in the scalar loop preheader
  /// after the epilogue skeleton has been created.
  DenseMap<PHINode *, Value *> Induction2AdditionalBypassValue;

```
?

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