[builtins] Properly optimize Object.prototype.isPrototypeOf.

src/compiler/js-typed-lowering.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_JS_TYPED_LOWERING_H_
 #define V8_COMPILER_JS_TYPED_LOWERING_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
@@ skipping 34 matching lines @@
   Reduction Reduce(Node* node) final;
 
  private:
   friend class JSBinopReduction;
 
   Reduction ReduceJSAdd(Node* node);
   Reduction ReduceJSComparison(Node* node);
   Reduction ReduceJSLoadNamed(Node* node);
   Reduction ReduceJSLoadProperty(Node* node);
   Reduction ReduceJSStoreProperty(Node* node);
+  Reduction ReduceJSHasInPrototypeChain(Node* node);
   Reduction ReduceJSOrdinaryHasInstance(Node* node);
   Reduction ReduceJSLoadContext(Node* node);
   Reduction ReduceJSStoreContext(Node* node);
   Reduction ReduceJSLoadModule(Node* node);
   Reduction ReduceJSStoreModule(Node* node);
   Reduction ReduceJSEqual(Node* node);
   Reduction ReduceJSStrictEqual(Node* node);
   Reduction ReduceJSToBoolean(Node* node);
   Reduction ReduceJSToInteger(Node* node);
   Reduction ReduceJSToLength(Node* node);
@@ skipping 21 matching lines @@
   Reduction ReduceUI32Shift(Node* node, Signedness signedness);
   Reduction ReduceCreateConsString(Node* node);
   Reduction ReduceSpeculativeNumberAdd(Node* node);
   Reduction ReduceSpeculativeNumberMultiply(Node* node);
   Reduction ReduceSpeculativeNumberBinop(Node* node);
   Reduction ReduceSpeculativeNumberComparison(Node* node);
 
   // 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_; }
   Isolate* isolate() const;
   JSOperatorBuilder* javascript() const;
   CommonOperatorBuilder* common() const;
   SimplifiedOperatorBuilder* simplified() const;
   CompilationDependencies* dependencies() const;
   Flags flags() const { return flags_; }
 
   CompilationDependencies* dependencies_;
   Flags flags_;
   JSGraph* jsgraph_;
   Type* shifted_int32_ranges_[4];
   Type* pointer_comparable_type_;
   TypeCache const& type_cache_;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSTypedLowering::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_TYPED_LOWERING_H_