[turbofan] Constant-fold certain JSOrdinaryHasInstance nodes.

src/compiler/js-native-context-specialization.h

Index: src/compiler/js-native-context-specialization.h
diff --git a/src/compiler/js-native-context-specialization.h b/src/compiler/js-native-context-specialization.h
index cd1b3349adac389c346837f3d1a9c43d2b5b26e8..e82f0664c7433a195745b4892d8e2ebbebce50e7 100644
--- a/src/compiler/js-native-context-specialization.h
+++ b/src/compiler/js-native-context-specialization.h
@@ -146,6 +146,17 @@ class JSNativeContextSpecialization final : public AdvancedReducer {
   // code dependencies and might use the array protector cell.
   bool CanTreatHoleAsUndefined(std::vector<Handle<Map>> const& receiver_maps);
 
+  // Checks if we know at compile time that the {receiver} either definitely
+  // has the {prototype} in it's prototype chain, or the {receiver} definitely
+  // doesn't have the {prototype} in it's prototype chain.
+  enum InferHasInPrototypeChainResult {
+    kIsInPrototypeChain,
+    kIsNotInPrototypeChain,
+    kMayBeInPrototypeChain
+  };
+  InferHasInPrototypeChainResult InferHasInPrototypeChain(
+      Node* receiver, Node* effect, Handle<JSReceiver> prototype);
+
   // Extract receiver maps from {nexus} and filter based on {receiver} if
   // possible.
   bool ExtractReceiverMaps(Node* receiver, Node* effect,