[llvm] [VPlan] Expand VPWidenIntOrFpInductionRecipe into separate recipes (PR #118638)

[Alexey Bataev via llvm-commits]

================
@@ -1043,29 +1043,19 @@ void VPlan::execute(VPTransformState *State) {
     if (isa<VPWidenPHIRecipe>(&R))
       continue;
 
-    if (isa<VPWidenPointerInductionRecipe>(&R) ||
-        isa<VPWidenIntOrFpInductionRecipe>(&R)) {
-      PHINode *Phi = nullptr;
-      if (isa<VPWidenIntOrFpInductionRecipe>(&R)) {
-        Phi = cast<PHINode>(State->get(R.getVPSingleValue()));
-      } else {
-        auto *WidenPhi = cast<VPWidenPointerInductionRecipe>(&R);
-        assert(!WidenPhi->onlyScalarsGenerated(State->VF.isScalable()) &&
-               "recipe generating only scalars should have been replaced");
-        auto *GEP = cast<GetElementPtrInst>(State->get(WidenPhi));
-        Phi = cast<PHINode>(GEP->getPointerOperand());
-      }
+    if (isa<VPWidenPointerInductionRecipe>(&R)) {
+      auto *WidenPhi = cast<VPWidenPointerInductionRecipe>(&R);
----------------
alexey-bataev wrote:

```suggestion
    if (auto *WidenPhi = dyn_cast<VPWidenPointerInductionRecipe>(&R)) {
```


https://github.com/llvm/llvm-project/pull/118638