Wrap program into (function(){ <prog> })() instead of !function...().

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 3ce64378629b5edac168920fc746c13481390336..d07377b26d37f2e40f4e00cb7a097457587cbfdf 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
@@ -904,7 +904,7 @@ function parseFunctionDescriptor(proto, name, descriptor, typesOffset) {
 // Declare deferred-initializer global.
 #deferredInitializer;
 
-!function(start, program) {
+(function(start, program) {
   // Initialize holder objects.
   #holders;
   var nativeInfos = Object.create(null);
@@ -1238,7 +1238,7 @@ function parseFunctionDescriptor(proto, name, descriptor, typesOffset) {
 
   #invokeMain;  // Start main.
 
-}(Date.now(), #code)
+})(Date.now(), #code)
 }""";
 
 }