[compiler] Decouple ToObject from CreateWithContext.

src/compiler/ast-graph-builder.cc

 // 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.
 
 #include "src/compiler/ast-graph-builder.h"
 
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/linkage.h"
@@ skipping 1181 matching lines @@
 void AstGraphBuilder::VisitReturnStatement(ReturnStatement* stmt) {
   VisitForValue(stmt->expression());
   Node* result = environment()->Pop();
   execution_control()->ReturnValue(result);
 }
 
 
 void AstGraphBuilder::VisitWithStatement(WithStatement* stmt) {
   VisitForValue(stmt->expression());
   Node* value = environment()->Pop();
+  Node* object = BuildToObject(value, stmt->ToObjectId());
   const Operator* op = javascript()->CreateWithContext();
-  Node* context = NewNode(op, value, GetFunctionClosureForContext());
+  Node* context = NewNode(op, object, GetFunctionClosureForContext());
   PrepareFrameState(context, stmt->EntryId());
   VisitInScope(stmt->statement(), stmt->scope(), context);
 }
 
 
 void AstGraphBuilder::VisitSwitchStatement(SwitchStatement* stmt) {
   ZoneList<CaseClause*>* clauses = stmt->cases();
   SwitchBuilder compare_switch(this, clauses->length());
   ControlScopeForBreakable scope(this, stmt, &compare_switch);
   compare_switch.BeginSwitch();
@@ skipping 3090 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8