Fix class inheritance in IE10 (#7969)

* Revert "Move subclass inheritance to end (#7772)"

This reverts commit f8ab9466d3.

* Only use getPrototypeOf if setPrototypeOf is implemented

* Update fixtures

* Helpers updates

* Update fixtures

* Fall back to getPrototypeOf

* Update fixtures

packages/babel-plugin-transform-react-jsx/test/fixtures/react/optimisation.react.constant-elements/output.js

@@ -11,6 +11,8 @@ let App =
 function (_React$Component) {
   "use strict";
 
+  babelHelpers.inherits(App, _React$Component);
+
   function App() {
     babelHelpers.classCallCheck(this, App);
     return babelHelpers.possibleConstructorReturn(this, babelHelpers.getPrototypeOf(App).apply(this, arguments));
@@ -29,6 +31,5 @@ function (_React$Component) {
     </div>;
     }
   }]);
-  babelHelpers.inherits(App, _React$Component);
   return App;
 }(React.Component);