Last snapshot bits to get working precompiled hello_world on x64.

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
@@ skipping 733 matching lines @@
   result = DartUtils::PrepareForScriptLoading(package_root,
                                               packages_file,
                                               false,
                                               has_trace_loading,
                                               builtin_lib);
   CHECK_RESULT(result);
 
   result = Dart_SetEnvironmentCallback(EnvironmentCallback);
   CHECK_RESULT(result);
 
-  // Load the script.
-  result = DartUtils::LoadScript(script_uri, builtin_lib);
-  CHECK_RESULT(result);
+  if (!has_run_precompiled_snapshot) {
+    // Load the script.
+    result = DartUtils::LoadScript(script_uri, builtin_lib);
+    CHECK_RESULT(result);
 
-  // Run event-loop and wait for script loading to complete.
-  result = Dart_RunLoop();
-  CHECK_RESULT(result);
+    // Run event-loop and wait for script loading to complete.
+    result = Dart_RunLoop();
+    CHECK_RESULT(result);
 
-  if (isolate_data->load_async_id >= 0) {
-    Dart_TimelineAsyncEnd("LoadScript", isolate_data->load_async_id);
+    if (isolate_data->load_async_id >= 0) {
+      Dart_TimelineAsyncEnd("LoadScript", isolate_data->load_async_id);
+    }
+
+    Platform::SetPackageRoot(package_root);
+
+    result = DartUtils::SetupIOLibrary(script_uri);
+    CHECK_RESULT(result);
   }
 
-  Platform::SetPackageRoot(package_root);
-
-  result = DartUtils::SetupIOLibrary(script_uri);
-  CHECK_RESULT(result);
-
   // Make the isolate runnable so that it is ready to handle messages.
   Dart_ExitScope();
   Dart_ExitIsolate();
   bool retval = Dart_IsolateMakeRunnable(isolate);
   if (!retval) {
     *error = strdup("Invalid isolate state - Unable to make it runnable");
     Dart_EnterIsolate(isolate);
     Dart_ShutdownIsolate();
     return NULL;
   }
@@ skipping 587 matching lines @@
   exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }