[turbofan] Also constant-fold Object.getPrototypeOf if possible.

src/compiler/js-call-reducer.h

 // Copyright 2015 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_CALL_REDUCER_H_
 #define V8_COMPILER_JS_CALL_REDUCER_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
 
@@ skipping 29 matching lines @@
  private:
   Reduction ReduceArrayConstructor(Node* node);
   Reduction ReduceBooleanConstructor(Node* node);
   Reduction ReduceCallApiFunction(
       Node* node, Node* target,
       Handle<FunctionTemplateInfo> function_template_info);
   Reduction ReduceNumberConstructor(Node* node);
   Reduction ReduceFunctionPrototypeApply(Node* node);
   Reduction ReduceFunctionPrototypeCall(Node* node);
   Reduction ReduceFunctionPrototypeHasInstance(Node* node);
+  Reduction ReduceObjectGetPrototype(Node* node, Node* object);
+  Reduction ReduceObjectGetPrototypeOf(Node* node);
   Reduction ReduceObjectPrototypeGetProto(Node* node);
+  Reduction ReduceReflectGetPrototypeOf(Node* node);
   Reduction ReduceSpreadCall(Node* node, int arity);
   Reduction ReduceJSConstruct(Node* node);
   Reduction ReduceJSConstructWithSpread(Node* node);
   Reduction ReduceJSCall(Node* node);
   Reduction ReduceJSCallWithSpread(Node* node);
 
   enum HolderLookup { kHolderNotFound, kHolderIsReceiver, kHolderFound };
 
   HolderLookup LookupHolder(Handle<JSObject> object,
                             Handle<FunctionTemplateInfo> function_template_info,
@@ skipping 12 matching lines @@
   JSGraph* const jsgraph_;
   Handle<Context> const native_context_;
   CompilationDependencies* const dependencies_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_CALL_REDUCER_H_