[crankshaft] Properly optimize %_ToObject.

src/hydrogen.cc

 // Copyright 2013 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/hydrogen.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 12082 matching lines @@
 
 void HOptimizedGraphBuilder::GenerateIsObject(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HIsObjectAndBranch* result = New<HIsObjectAndBranch>(value);
   return ast_context()->ReturnControl(result, call->id());
 }
 
 
+void HOptimizedGraphBuilder::GenerateToObject(CallRuntime* call) {
+  DCHECK_EQ(1, call->arguments()->length());
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* value = Pop();
+  HValue* result = BuildToObject(value);
+  return ast_context()->ReturnValue(result);
+}
+
+
 void HOptimizedGraphBuilder::GenerateIsJSProxy(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HIfContinuation continuation;
   IfBuilder if_proxy(this);
 
   HValue* smicheck = if_proxy.IfNot<HIsSmiAndBranch>(value);
   if_proxy.And();
   HValue* map = Add<HLoadNamedField>(value, smicheck, HObjectAccess::ForMap());
@@ skipping 1385 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8