[interpreter, debugger] implement debugger statement.

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 247 matching lines @@
   V(ForInNextWide, OperandType::kReg16, OperandType::kReg16,                   \
     OperandType::kRegPair16)                                                   \
   V(ForInStep, OperandType::kReg8)                                             \
                                                                                \
   /* Perform a stack guard check */                                            \
   V(StackCheck, OperandType::kNone)                                            \
                                                                                \
   /* Non-local flow control */                                                 \
   V(Throw, OperandType::kNone)                                                 \
   V(ReThrow, OperandType::kNone)                                               \
-  V(Return, OperandType::kNone)
+  V(Return, OperandType::kNone)                                                \
+                                                                               \
+  /* Debugger */                                                               \
+  V(Debugger, OperandType::kNone)
 
 // Enumeration of the size classes of operand types used by bytecodes.
 enum class OperandSize : uint8_t {
   kNone = 0,
   kByte = 1,
   kShort = 2,
 };
 
 
 // Enumeration of operand types used by bytecodes.
@@ skipping 208 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_