[benchmarks] Apparently Golem has a metric called StartupTime.

Change-Id: Id4375435ffeda6a442dc6963323d8d494e8344ff
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/242360
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

benchmarks/Startup/dart/Startup.dart

@@ -76,7 +76,7 @@ Future<void> main(List<String> args) async {
       print(ends.toList());
       throw '$name is missing or ambiguous';
     }
-    print('Startup.$name(RunTimeRaw): $micros us.');
+    print('Startup.$name(StartupTime): $micros us.');
   }
 
   report('CreateIsolateGroupAndSetupHelper', null);

benchmarks/Startup/dart2/Startup.dart

@@ -78,7 +78,7 @@ Future<void> main(List<String> args) async {
       print(ends.toList());
       throw '$name is missing or ambiguous';
     }
-    print('Startup.$name(RunTimeRaw): $micros us.');
+    print('Startup.$name(StartupTime): $micros us.');
   }
 
   report('CreateIsolateGroupAndSetupHelper', null);