Extract invoke-main stub generator.

pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart b/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
index 1b92ce6405a3f3f89161f8f3b0526a58a83763f0..a1ebd8e858cbb778e17cc8fc34fc51fc451fbcd1 100644
--- a/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
@@ -116,7 +116,7 @@ class ModelEmitter {
          emitStaticNonFinalFields(fragment.staticNonFinalFields),
        'operatorIsPrefix': js.string(namer.operatorIsPrefix),
        'eagerClasses': emitEagerClassInitializations(fragment.libraries),
-       'main': fragment.main,
+       'invokeMain': fragment.invokeMain,
        'code': code};
 
     holes.addAll(nativeHoles(program));
@@ -914,7 +914,7 @@ function parseFunctionDescriptor(proto, name, descriptor) {
   var end = Date.now();
   print('Setup: ' + (end - start) + ' ms.');
 
-  #main();  // Start main.
+  #invokeMain;  // Start main.
 
 }(Date.now(), #code)
 }""";