Fix timer overflow on small, fast snippets (#55200)
Summary:
- Fixes https://github.com/pytorch/pytorch/issues/54114
- Capped estimated block size to the largest multiple of ten less than C++ INT_MAX
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55200
Test Plan: unit test doesn't throw exception as expected
Reviewed By: robieta
Differential Revision: D27542652
Pulled By: naveedgol
fbshipit-source-id: 3ba68ce84d5fa1d8338cdd5c9f9e5d8c9adda51c
