[pt2] add symbolic shape support for decompose mm and expose max_block to user config (#121440)
Summary:
1) As described in https://fb.workplace.com/groups/1075192433118967/permalink/1381918665779674/
As a follow up, we can increase max_block["y"] to sovle the issue
2) add symbolic shape support for decompose mm pass. I did not find a good way to compare symint with int. So when there is a symbolic shape, i would assume it is a "large" dim.
Test Plan:
Without change block: aps-pt2-7c23cea900
increase y_block: aps-pt2_dynamic_shape-25a027423c
Differential Revision: D54525453
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121440
Approved by: https://github.com/mengluy0125, https://github.com/Yuzhen11
