benchmark

42785452 - Skip the bisection when the start and end hash are the same (#2044)

Skip the bisection when the start and end hash are the same (#2044) Summary: Nightly releases could be built from the same commit on the main branch (e.g. [20231112](https://github.com/pytorch/pytorch/commit/63a5a14da9ef3ebd68ce0cebea4aa84e030a2cf8) and [20231113](https://github.com/pytorch/pytorch/commit/a45a8bf9e7e1530692f2703f8da430bc2825af7c)). If it happens, we can just skip the bisection because there is no code change. Pull Request resolved: https://github.com/pytorch/benchmark/pull/2044 Test Plan: https://github.com/pytorch/benchmark/actions/runs/6906833305 Reviewed By: aaronenyeshi Differential Revision: D51429932 Pulled By: xuzhao9 fbshipit-source-id: 1ee006f12006689f53483bbf8beb764557e024ca