[llvm] [VPlan] Introduce CSE pass (PR #151872)

[Florian Hahn via llvm-commits]

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@@ -185,8 +185,14 @@ class LLVM_ABI_FOR_TEST VPValue {
     assert(!UnderlyingVal && "Underlying Value is already set.");
     UnderlyingVal = Val;
   }
+
+  // Equality of data.
+  bool isIdenticalTo(const VPValue *Other) const;
 };
 
+// Hash method for VPValue.
+hash_code hash_value(const VPValue &V);
+
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fhahn wrote:

better move to only user in VPlanTransforms

https://github.com/llvm/llvm-project/pull/151872