[JIT] fix broadcasting lists of ints (#39481)
Summary:
Previously, on conversion from python -> c++ it was casted to double list through bad copy pasta. It's pretty unusual for someone to script a broadcasting list function directly since it's an internal api, so it was unlikely to affect anyone.
Fix for https://github.com/pytorch/pytorch/issues/39450
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39481
Reviewed By: jamesr66a
Differential Revision: D21870557
Pulled By: eellison
fbshipit-source-id: e704e5e87d2702a270b7d65c4df444246a134480
