[Interpreter] Add support for loading literals from the constant pool.

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.
 // Do not include anything from src/interpreter here!
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
 // The list of operand types used by bytecodes.
 #define OPERAND_TYPE_LIST(V) \
   V(None)                    \
   V(Imm8)                    \
+  V(Idx)                     \
   V(Reg)
 
 // The list of bytecodes which are interpreted by the interpreter.
 #define BYTECODE_LIST(V)               \
                                        \
   /* Loading the accumulator */        \
   V(LdaZero, OperandType::kNone)       \
   V(LdaSmi8, OperandType::kImm8)       \
+  V(LdaConstant, OperandType::kIdx)    \
   V(LdaUndefined, OperandType::kNone)  \
   V(LdaNull, OperandType::kNone)       \
   V(LdaTheHole, OperandType::kNone)    \
   V(LdaTrue, OperandType::kNone)       \
   V(LdaFalse, OperandType::kNone)      \
                                        \
   /* Register-accumulator transfers */ \
   V(Ldar, OperandType::kReg)           \
   V(Star, OperandType::kReg)           \
                                        \
@@ skipping 71 matching lines @@
 };
 
 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_