[llvm] [VPlan] Compute induction end values in VPlan. (PR #112145)

[via llvm-commits]

================
@@ -9439,6 +9418,20 @@ VPlanPtr LoopVectorizationPlanner::buildVPlan(VFRange &Range) {
   bool HasNUW = true;
   addCanonicalIVRecipes(*Plan, Legal->getWidestInductionType(), HasNUW,
                         DebugLoc());
+
----------------
ayalz wrote:

Would something like this
```
  VPRecipeBuilder RecipeBuilder(...); // As in tryToBuildVPlanWithVPRecipes() following addCanonicalIVRecipes();
  for (auto &R : Plan->getVectorLoopRegion()->getEntryBasicBlock()->phis()) {
    auto *HeaderR = cast<VPHeaderPHIRecipe>(&R);
    RecipeBuilder.setRecipe(HeaderR->getUnderlyingInstr(), HeaderR);
  }
  addScalarResumePhis(*Plan, RecipeBuilder);
```
work?

https://github.com/llvm/llvm-project/pull/112145