src: do not crash if ToggleAsyncHook fails during termination

In the termination case, we should not crash. There’s also no harm
being done by ignoring the termination exception here, since the
thread is about to be torn down anyway.

Also, add a guard against running this during shutdown. That is the
likely cause of nodejs#34361.

Fixes: nodejs#34361

Author: addaleax

src/inspector_agent.cc

@@ -841,13 +841,14 @@ void Agent::DisableAsyncHook() {
 
 void Agent::ToggleAsyncHook(Isolate* isolate,
                             const Global<Function>& fn) {
+  if (!parent_env_->can_call_into_js()) return;
   CHECK(parent_env_->has_run_bootstrapping_code());
   HandleScope handle_scope(isolate);
   CHECK(!fn.IsEmpty());
   auto context = parent_env_->context();
   v8::TryCatch try_catch(isolate);
   USE(fn.Get(isolate)->Call(context, Undefined(isolate), 0, nullptr));
-  if (try_catch.HasCaught()) {
+  if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
     PrintCaughtException(isolate, context, try_catch);
     FatalError("\nnode::inspector::Agent::ToggleAsyncHook",
                "Cannot toggle Inspector's AsyncHook, please report this.");