Divide CodeBlock into NativeCodeBlock and InterpretedCodeBlock

* NativeCodeBlock is newly added for NativeFunctionObject
* all interpreter-related info is moved into InterpretedCodeBlock

Signed-off-by: HyukWoo Park <hyukwoo.park@samsung.com>

src/runtime/ScriptGeneratorFunctionObject.cpp

@@ -62,7 +62,7 @@ public:
                 }
             }
         } else {
-            ASSERT(self->codeBlock()->isArrowFunctionExpression());
+            ASSERT(self->interpretedCodeBlock()->isArrowFunctionExpression());
             return thisValue;
         }
     }