[interpreter, debugger] support debug breaks via bytecode array copy

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 239 matching lines @@
 
   // Exception handling.
   BytecodeArrayBuilder& MarkHandler(int handler_id, bool will_catch);
   BytecodeArrayBuilder& MarkTryBegin(int handler_id, Register context);
   BytecodeArrayBuilder& MarkTryEnd(int handler_id);
 
   // Creates a new handler table entry and returns a {hander_id} identifying the
   // entry, so that it can be referenced by above exception handling support.
   int NewHandlerEntry() { return handler_table_builder()->NewHandlerEntry(); }
 
-  void SetReturnPosition(FunctionLiteral* fun);
   void SetStatementPosition(Statement* stmt);
   void SetExpressionPosition(Expression* expr);
 
   // Accessors
   Zone* zone() const { return zone_; }
   TemporaryRegisterAllocator* temporary_register_allocator() {
     return &temporary_allocator_;
   }
   const TemporaryRegisterAllocator* temporary_register_allocator() const {
     return &temporary_allocator_;
@@ skipping 57 matching lines @@
   void LeaveBasicBlock();
 
   bool OperandIsValid(Bytecode bytecode, int operand_index,
                       uint32_t operand_value) const;
   bool RegisterIsValid(Register reg, OperandType reg_type) const;
 
   bool LastBytecodeInSameBlock() const;
   bool NeedToBooleanCast();
   bool IsRegisterInAccumulator(Register reg);
 
+  // Set position for implicit return.
+  void SetReturnPosition(FunctionLiteral* fun);
+
   // Gets a constant pool entry for the |object|.
   size_t GetConstantPoolEntry(Handle<Object> object);
 
   ZoneVector<uint8_t>* bytecodes() { return &bytecodes_; }
   const ZoneVector<uint8_t>* bytecodes() const { return &bytecodes_; }
   Isolate* isolate() const { return isolate_; }
   ConstantArrayBuilder* constant_array_builder() {
     return &constant_array_builder_;
   }
   const ConstantArrayBuilder* constant_array_builder() const {
@@ skipping 66 matching lines @@
   size_t offset_;
 
   friend class BytecodeArrayBuilder;
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_