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

src/interpreter/bytecodes.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_BYTECODES_H_
 #define V8_INTERPRETER_BYTECODES_H_
 
 #include <iosfwd>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
@@ skipping 230 matching lines @@
   V(JumpIfToBooleanTrueConstantWide, OperandType::kIdx16)                      \
   V(JumpIfToBooleanFalse, OperandType::kImm8)                                  \
   V(JumpIfToBooleanFalseConstant, OperandType::kIdx8)                          \
   V(JumpIfToBooleanFalseConstantWide, OperandType::kIdx16)                     \
   V(JumpIfNull, OperandType::kImm8)                                            \
   V(JumpIfNullConstant, OperandType::kIdx8)                                    \
   V(JumpIfNullConstantWide, OperandType::kIdx16)                               \
   V(JumpIfUndefined, OperandType::kImm8)                                       \
   V(JumpIfUndefinedConstant, OperandType::kIdx8)                               \
   V(JumpIfUndefinedConstantWide, OperandType::kIdx16)                          \
+  /* TODO(mythria): Replace with opcodes that throw on a hole */               \
+  V(JumpIfHole, OperandType::kImm8)                                            \
+  V(JumpIfNotHole, OperandType::kImm8)                                         \
                                                                                \
   /* Complex flow control For..in */                                           \
   V(ForInPrepare, OperandType::kRegOutTriple8)                                 \
   V(ForInPrepareWide, OperandType::kRegOutTriple16)                            \
   V(ForInDone, OperandType::kReg8, OperandType::kReg8)                         \
   V(ForInNext, OperandType::kReg8, OperandType::kReg8, OperandType::kRegPair8) \
   V(ForInNextWide, OperandType::kReg16, OperandType::kReg16,                   \
     OperandType::kRegPair16)                                                   \
   V(ForInStep, OperandType::kReg8)                                             \
                                                                                \
@@ skipping 211 matching lines @@
 
 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_