[TensorExpr][CPU] Fix bool -> int casting (#46951)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46951
If e.g. we're casting from torch.int -> torch.bool, previously we would just truncate from int32 -> i8. Since torch.bool has 8 bits but only uses one of them, we need to makes sure that one bit is set.
Test Plan: Imported from OSS
Reviewed By: ansley
Differential Revision: D24805253
Pulled By: eellison
fbshipit-source-id: af3aa323f10820d189827eb51037adfa7d80fed9
