src: try showing stack traces when process._fatalException is not set

So that the stack trace of errors shown in internal code run during
bootstrap (before process._fatalException is set) can be printed.

PR-URL: #29624
Refs: #29593
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: joyeecheung

src/node_errors.cc

@@ -324,6 +324,8 @@ static void ReportFatalException(Environment* env,
         break;
       }
       case EnhanceFatalException::kDontEnhance: {
+        USE(err_obj->Get(env->context(), env->stack_string())
+                .ToLocal(&stack_trace));
         report_to_inspector();
         break;
       }