[Interpreter] Introduce IncStub and DecStub.

src/interpreter/interpreter.h

Index: src/interpreter/interpreter.h
diff --git a/src/interpreter/interpreter.h b/src/interpreter/interpreter.h
index 155b2b5abee577c3517f97031259907aec21cd15..caa33f4ecd5cea5642481a07dfbe53c5611c89f0 100644
--- a/src/interpreter/interpreter.h
+++ b/src/interpreter/interpreter.h
@@ -73,9 +73,8 @@ class Interpreter {
   void DoBinaryOp(Runtime::FunctionId function_id,
                   InterpreterAssembler* assembler);
 
-  // Generates code to perform the count operations via |function_id|.
-  void DoCountOp(Runtime::FunctionId function_id,
-                 InterpreterAssembler* assembler);
+  // Generates code to perform the count operations via |callable|.
+  void DoCountOp(Callable callable, InterpreterAssembler* assembler);
 
   // Generates code to perform the comparison operation associated with
   // |compare_op|.
@@ -120,7 +119,7 @@ class Interpreter {
   // Generates code to perform a type conversion.
   void DoTypeConversionOp(Callable callable, InterpreterAssembler* assembler);
 
-  // Generates code ro create a literal via |function_id|.
+  // Generates code to create a literal via |function_id|.
   void DoCreateLiteral(Runtime::FunctionId function_id,
                        InterpreterAssembler* assembler);