Increase the chance of printing a useful error when bootstrapping fails

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index fe75c6bac066d25cc0eecb538665335de396784a..5db418f085e63241fa7765330a35bab9ef419536 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1087,6 +1087,13 @@ Handle<Object> Factory::NewError(const char* maker,
                                  Handle<Object> arg2) {
   HandleScope scope(isolate());
   Handle<String> error_maker = InternalizeUtf8String(maker);
+  if (isolate()->bootstrapper()->IsActive()) {
+    // If this exception is being thrown during bootstrapping,
+    // js_builtins_object is unavailable. We return the error maker
+    // name's string as the exception since we have nothing better
+    // to do.
+    return scope.CloseAndEscape(error_maker);
+  }
   Handle<Object> fun_obj = Object::GetProperty(isolate()->js_builtins_object(),
                                                error_maker).ToHandleChecked();