Load deferred classes eagerly when generating script snapshots

runtime/bin/main.cc

Index: runtime/bin/main.cc
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index a5c3563cafd32a180469959ac9113f47a91faa22..7bb98a12a1a9fdb668207f69496db8c805923481 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -872,7 +872,8 @@ static const char* ServiceRequestHandler(
 
 void main(int argc, char** argv) {
   char* script_name;
-  CommandLineOptions vm_options(argc);
+  const int EXTRA_VM_ARGUMENTS = 2;
+  CommandLineOptions vm_options(argc + EXTRA_VM_ARGUMENTS);
   CommandLineOptions dart_options(argc);
   bool print_flags_seen = false;
   bool verbose_debug_seen = false;
@@ -921,6 +922,10 @@ void main(int argc, char** argv) {
     exit(kErrorExitCode);
   }
 
+  if (generate_script_snapshot) {
+    vm_options.AddArgument("--load_deferred_eagerly");
+  }
+
   Dart_SetVMFlags(vm_options.count(), vm_options.arguments());
 
   // Start event handler.