Don't use IsolateData for the exit hook as multiple embedders share the dart/bin while using differ…

runtime/bin/main.cc

Index: runtime/bin/main.cc
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index c953b625dfeba5180a32e44ff605cab9a6622cc0..0f9f4f43f101dc0491f51ef02e6e109a4ed862d7 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -798,9 +798,6 @@ static Dart_Isolate CreateIsolateAndSetupHelper(const char* script_uri,
   IsolateData* isolate_data = new IsolateData(script_uri,
                                               package_root,
                                               packages_config);
-  if (gen_snapshot_kind == kAppJIT) {
-    isolate_data->set_exit_hook(SnapshotOnExitHook);
-  }
   Dart_Isolate isolate = Dart_CreateIsolate(script_uri,
                                             main,
                                             isolate_snapshot_buffer,
@@ -1891,6 +1888,9 @@ void main(int argc, char** argv) {
 #if defined(DART_PRECOMPILED_RUNTIME)
   vm_options.AddArgument("--precompilation");
 #endif
+  if (gen_snapshot_kind == kAppJIT) {
+    Process::SetExitHook(SnapshotOnExitHook);
+  }
 
   Dart_SetVMFlags(vm_options.count(), vm_options.arguments());