fix static member expression calls, make classes more spec-compliant

test/fixtures/syntax/classes/statement/actual.js

@@ -4,4 +4,8 @@ var BaseView = class BaseView {
   }
 }
 
-module.exports = BaseView;
+var BaseView = class {
+  constructor() {
+    this.autoRender = true;
+  }
+}

test/fixtures/syntax/classes/statement/expected.js

@@ -1,9 +1,14 @@
 var BaseView = function () {
-  function BaseView() {
+  var BaseView = function BaseView() {
     this.autoRender = true;
-  }
+  };
 
   return BaseView;
 }();
 
-module.exports = BaseView;
+var BaseView = function () {
+  var _class = function () {
+    this.autoRender = true;
+  };
+  return _class;
+}();