[llvm] [VPlan] First step towards VPlan cost modeling (LegacyCM in CostCtx) (PR #92555)

[via llvm-commits]

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@@ -747,6 +747,71 @@ void VPRegionBlock::execute(VPTransformState *State) {
   State->Instance.reset();
 }
 
+InstructionCost VPBasicBlock::cost(ElementCount VF, VPCostContext &Ctx) {
+  InstructionCost Cost = 0;
+  for (VPRecipeBase &R : *this)
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ayalz wrote:

```suggestion
  for (VPRecipeBase &R : Recipes)
```

https://github.com/llvm/llvm-project/pull/92555