[Interpreter] Adds support for const/let variables to interpreter.

src/interpreter/bytecode-array-builder.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_BYTECODE_ARRAY_BUILDER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 
 #include "src/ast/ast.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 217 matching lines @@
 
   // Flow Control.
   BytecodeArrayBuilder& Bind(BytecodeLabel* label);
   BytecodeArrayBuilder& Bind(const BytecodeLabel& target, BytecodeLabel* label);
 
   BytecodeArrayBuilder& Jump(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfTrue(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfFalse(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfNull(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfUndefined(BytecodeLabel* label);
+  BytecodeArrayBuilder& JumpIfHole(BytecodeLabel* label);
+  BytecodeArrayBuilder& JumpIfNotHole(BytecodeLabel* label);
 
   BytecodeArrayBuilder& StackCheck();
 
   BytecodeArrayBuilder& Throw();
   BytecodeArrayBuilder& ReThrow();
   BytecodeArrayBuilder& Return();
 
   // Debugger.
   BytecodeArrayBuilder& Debugger();
 
@@ skipping 170 matching lines @@
   size_t offset_;
 
   friend class BytecodeArrayBuilder;
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_