Load deferred classes eagerly when generating script snapshots

runtime/bin/gen_snapshot.cc

Index: runtime/bin/gen_snapshot.cc
diff --git a/runtime/bin/gen_snapshot.cc b/runtime/bin/gen_snapshot.cc
index b55575da3a741af6c2f7a35aaf11c711f8b94d8b..544cf32fa28763be5f7d5e00c7cc83254e80305c 100644
--- a/runtime/bin/gen_snapshot.cc
+++ b/runtime/bin/gen_snapshot.cc
@@ -516,7 +516,8 @@ static void SetupForGenericSnapshotCreation() {
 
 
 int main(int argc, char** argv) {
-  CommandLineOptions vm_options(argc);
+  const int EXTRA_VM_ARGUMENTS = 1;
+  CommandLineOptions vm_options(argc + EXTRA_VM_ARGUMENTS);
 
   // Initialize the URL mapping array.
   CommandLineOptions url_mapping_array(argc);
@@ -534,6 +535,8 @@ int main(int argc, char** argv) {
   Thread::InitOnce();
   DartUtils::SetOriginalWorkingDirectory();
 
+  vm_options.AddArgument("--load_deferred_eagerly");
+
   Dart_SetVMFlags(vm_options.count(), vm_options.arguments());
 
   // Initialize the Dart VM.