refactor(benchmarks): add index_aot to support AoT bootstrap. (#12105)

Note: This only make sure it can compile the AoT version, but does not yet use it in e2e tests.

modules/benchmarks/src/tree/ng2_switch/index_aot.ts

@@ -0,0 +1,8 @@
+import {enableProdMode} from '@angular/core';
+import {platformBrowser} from '@angular/platform-browser';
+
+import {init} from './init';
+import {AppModuleNgFactory} from './tree.ngfactory';
+
+enableProdMode();
+platformBrowser().bootstrapModuleFactory(AppModuleNgFactory).then(init);