[turbofan] Do constant-folding of JSHasInPrototypeChain early.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index 74bb25700822b7f63ac6c02d7fb49a4b76cb250c..cf235bb14bb9eb78ccbab6f06c8b8f27cce7c950 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -94,17 +94,6 @@ class V8_EXPORT_PRIVATE JSTypedLowering final
   // Helper for ReduceJSLoadModule and ReduceJSStoreModule.
   Node* BuildGetModuleCell(Node* node);
 
-  // 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<HeapObject> prototype);
-
   Factory* factory() const;
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }