Fix race condition an isolate is being added to the isolate list before the name for the isolate is…

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
===================================================================
--- runtime/vm/isolate.cc	(revision 43705)
+++ runtime/vm/isolate.cc	(working copy)
@@ -633,11 +633,6 @@
   ISOLATE_METRIC_LIST(ISOLATE_METRIC_INIT);
 #undef ISOLATE_METRIC_INIT
 
-
-  // Add to isolate list.
-  AddIsolateTolist(result);
-
-
   // TODO(5411455): For now just set the recently created isolate as
   // the current isolate.
   SetCurrent(result);
@@ -684,6 +679,9 @@
     }
   }
 
+  // Add to isolate list.
+  AddIsolateTolist(result);
+
   return result;
 }