[LT] Upstream more util functions (#69098)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69098
Add the following utils: helpers, ir_dump_util, and
tensor_util. Some of the util functions may be better organized by
grouping into different files, but we can leave that for later.
Test Plan: Imported from OSS
Reviewed By: alanwaketan
Differential Revision: D32758480
Pulled By: desertfire
fbshipit-source-id: 2a0707879f0c49573380b4c8227a3c916c99bf9a
