Implement analysis for for-loops (#119730)
This PR adds support for for-loop parsing and analysis. While doing so, I ran into some constant value and function name problems so I fixed them as well. Technically, it should be possible to break this into multiple PRs but since these are small, I'm bundling them together.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119730
Approved by: https://github.com/aakhundov
