[turbofan] Add checked load/store operators.

src/compiler/simplified-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_SIMPLIFIED_LOWERING_H_
 #define V8_COMPILER_SIMPLIFIED_LOWERING_H_
 
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
+// Forward declarations.
+class RepresentationChanger;
+
+
 class SimplifiedLowering FINAL {
  public:
   explicit SimplifiedLowering(JSGraph* jsgraph) : jsgraph_(jsgraph) {}
   ~SimplifiedLowering() {}
 
   void LowerAllNodes();
 
   // TODO(titzer): These are exposed for direct testing. Use a friend class.
   void DoLoadField(Node* node);
   void DoStoreField(Node* node);
   // TODO(turbofan): The output_type can be removed once the result of the
   // representation analysis is stored in the node bounds.
-  void DoLoadElement(Node* node, MachineType output_type);
+  void DoLoadBuffer(Node* node, MachineType output_type,
+                    RepresentationChanger* changer);
+  void DoStoreBuffer(Node* node);
+  void DoLoadElement(Node* node);
   void DoStoreElement(Node* node);
   void DoStringAdd(Node* node);
   void DoStringEqual(Node* node);
   void DoStringLessThan(Node* node);
   void DoStringLessThanOrEqual(Node* node);
 
  private:
   JSGraph* jsgraph_;
 
   Node* SmiTag(Node* node);
@@ skipping 14 matching lines @@
   Graph* graph() { return jsgraph()->graph(); }
   CommonOperatorBuilder* common() { return jsgraph()->common(); }
   MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_LOWERING_H_