[llvm] [LV]: Add costs to VPInstruction (PR #125008)

[Hassnaa Hamdi via llvm-commits]

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@@ -1315,6 +1315,9 @@ class VPInstruction : public VPRecipeWithIRFlags,
   InstructionCost computeCost(ElementCount VF,
                               VPCostContext &Ctx) const override {
     // TODO: Compute accurate cost after retiring the legacy cost model.
+    // Use legacy cost model for now.
+    if (auto *I = dyn_cast_or_null<Instruction>(getUnderlyingValue()))
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hassnaaHamdi wrote:

The original instruction was 'or disjoint' and it got replaced by the VPlanTransforms  to Add instruction wrapped in VPInstruction.

https://github.com/llvm/llvm-project/pull/125008