[Interpreter] Save and restore dispatch table pointer during calls.

src/interpreter/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_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 #define V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 
 #include "src/allocation.h"
 #include "src/base/smart-pointers.h"
 #include "src/builtins.h"
@@ skipping 167 matching lines @@
   compiler::Node* Advance(compiler::Node* delta);
 
   // Starts next instruction dispatch at |new_bytecode_offset|.
   void DispatchTo(compiler::Node* new_bytecode_offset);
 
   // Abort operations for debug code.
   void AbortIfWordNotEqual(compiler::Node* lhs, compiler::Node* rhs,
                            BailoutReason bailout_reason);
 
   Bytecode bytecode_;
-  compiler::Node* accumulator_;
-  compiler::Node* context_;
+  CodeStubAssembler::Variable accumulator_;
+  CodeStubAssembler::Variable context_;
+  CodeStubAssembler::Variable dispatch_table_;
 
   bool disable_stack_check_across_call_;
   compiler::Node* stack_pointer_before_call_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INTERPRETER_ASSEMBLER_H_