[fx][ShapeProp] make shapes and args/kwargs concrete for minimizer (#75291)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75291
As the title. Also adds debugging messaging to `ShapeProp.run_node`
Reviewed By: yuhc
Differential Revision: D34930081
fbshipit-source-id: ea4341ac2377b7b81404b14afeb5149d5556d92c
(cherry picked from commit 8a929a910c17cff69fac501c5b9260bb23f260e2)
