Parse int64 sizes/strides (#64076)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64076
We were parsing sizes into int32s, so if you had a tensor with more
than 2^32 elements, you couldn't represent it.
ghstack-source-id: 136933273
Test Plan: parseIR with size of 4e9
Reviewed By: ZolotukhinM
Differential Revision: D30521116
fbshipit-source-id: 1e28e462cba52d648e0e2acb4e234d86aae25a3e
