[Interpreter] Add support for local context loads and stores.

src/compiler/interpreter-assembler.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_INTERPRETER_ASSEMBLER_H_
 #define V8_COMPILER_INTERPRETER_ASSEMBLER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/allocation.h"
@@ skipping 79 matching lines @@
   Node* WordShl(Node* value, int shift);
 
   // Load constant at |index| in the constant pool.
   Node* LoadConstantPoolEntry(Node* index);
 
   // Load a field from an object on the heap.
   Node* LoadObjectField(Node* object, int offset);
 
   // Load |slot_index| from |context|.
   Node* LoadContextSlot(Node* context, Node* slot_index);
+  // Stores |value| into |slot_index| of |context|.
+  Node* StoreContextSlot(Node* context, Node* slot_index, Node* value);
 
   // Load the TypeFeedbackVector for the current function.
   Node* LoadTypeFeedbackVector();
 
   // Call JSFunction or Callable |function| with |arg_count| (not including
   // receiver) and the first argument located at |first_arg|.
   Node* CallJS(Node* function, Node* first_arg, Node* arg_count);
 
   // Call an IC code stub.
   Node* CallIC(CallInterfaceDescriptor descriptor, Node* target, Node* arg1,
@@ skipping 83 matching lines @@
   bool code_generated_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INTERPRETER_ASSEMBLER_H_