add classesFastSuper optional transformer - fixes #451

test/fixtures/transformation/optional-classes-fast-super/super-function-fallback/actual.js

@@ -0,0 +1,5 @@
+class Test {
+  constructor() {
+    super.hasOwnProperty("test");
+  }
+}

test/fixtures/transformation/optional-classes-fast-super/super-function-fallback/expected.js

@@ -0,0 +1,5 @@
+"use strict";
+
+var Test = function Test() {
+  Function.prototype.hasOwnProperty.call(this, "test");
+};