Enable verifier [2/n] (#1155)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/1155

X-link: https://github.com/pytorch/pytorch/pull/113075

Turn on verifier check for exportec program ctor. Note that this effectively detect a large surface of spec violations, so we also spend some time fixing them one by one in this diff.

Reviewed By: angelayi

Differential Revision: D51014944

fbshipit-source-id: 9a9e689ec9c8561a9c5cd4b6bd8836809ae5ff30