Update base for Update on "Integrate torchgen exception boundary with ExecuTorch"

As of #7746, we build with exceptions by default, so we just need to use them.

TODO: presumably we need to manage rollout of the torchgen patch?

Differential Revision: [D67904052](https://our.internmc.facebook.com/intern/diff/D67904052/)

[ghstack-poisoned]

Author: swolchok