[Interpreter] Add for/while/do support to the bytecode generator.

src/interpreter/bytecode-generator.h

Index: src/interpreter/bytecode-generator.h
diff --git a/src/interpreter/bytecode-generator.h b/src/interpreter/bytecode-generator.h
index 99536c33fb52fbf8d092eaff624fdd936ee675e5..e303941dfbf38570c45827542f4b8b43faec8035 100644
--- a/src/interpreter/bytecode-generator.h
+++ b/src/interpreter/bytecode-generator.h
@@ -25,15 +25,21 @@ class BytecodeGenerator : public AstVisitor {
 #undef DECLARE_VISIT
 
  private:
+  class ControlScope;
+  class ControlScopeForBreakable;
+  class ControlScopeForIteration;
+
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
 
   void VisitArithmeticExpression(BinaryOperation* binop);
   void VisitPropertyLoad(Register obj, Property* expr);
   void VisitVariableLoad(Variable* variable);
 
-  inline BytecodeArrayBuilder& builder() { return builder_; }
+  inline BytecodeArrayBuilder* builder() { return &builder_; }
   inline Scope* scope() const { return scope_; }
   inline void set_scope(Scope* scope) { scope_ = scope; }
+  inline ControlScope* control_scope() const { return control_scope_; }
+  inline void set_control_scope(ControlScope* scope) { control_scope_ = scope; }
   inline CompilationInfo* info() const { return info_; }
   inline void set_info(CompilationInfo* info) { info_ = info; }
 
@@ -43,6 +49,7 @@ class BytecodeGenerator : public AstVisitor {
   BytecodeArrayBuilder builder_;
   CompilationInfo* info_;
   Scope* scope_;
+  ControlScope* control_scope_;
 };
 
 }  // namespace interpreter