[stubs] Unify (and optimize) implementation of ToObject.

src/code-stubs-hydrogen.cc

 // Copyright 2012 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.
 
 #include "src/v8.h"
 
 #include "src/bailout-reason.h"
 #include "src/code-stubs.h"
 #include "src/field-index.h"
 #include "src/hydrogen.h"
@@ skipping 1639 matching lines @@
 
   return value;
 }
 
 
 Handle<Code> ElementsTransitionAndStoreStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
+template <>
+HValue* CodeStubGraphBuilder<ToObjectStub>::BuildCodeStub() {
+  HValue* receiver = GetParameter(ToObjectDescriptor::kReceiverIndex);
+  return BuildToObject(receiver);
+}
+
+
+Handle<Code> ToObjectStub::GenerateCode() { return DoGenerateCode(this); }
+
+
 void CodeStubGraphBuilderBase::BuildCheckAndInstallOptimizedCode(
     HValue* js_function,
     HValue* native_context,
     IfBuilder* builder,
     HValue* optimized_map,
     HValue* map_index) {
   HValue* osr_ast_id_none = Add<HConstant>(BailoutId::None().ToInt());
   HValue* context_slot = LoadFromOptimizedCodeMap(
       optimized_map, map_index, SharedFunctionInfo::kContextOffset);
   HValue* osr_ast_slot = LoadFromOptimizedCodeMap(
@@ skipping 541 matching lines @@
   return Pop();
 }
 
 
 Handle<Code> KeyedLoadGenericStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 }  // namespace internal
 }  // namespace v8