[inductor] Use shape env bounds in inductor bounds.py (#106175) (#106568)
Summary: If constrained ranges are available, use them in bounds.py before value range analysis (to enable Int64 -> Int32 optimization).
Test Plan: New unit test in test_torchinductor.py to mark a tensor as dynamic, then constrain with constrain_as_size (as outlined in https://github.com/pytorch/pytorch/issues/106175)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106568
Approved by: https://github.com/eellison, https://github.com/lezcano
