Set dump_exported_program to True in bench (#131670)
Summary:
X-link: https://github.com/pytorch/pytorch/pull/131670
Approved by: https://github.com/titaiwangms
Reviewed By: clee2000
Differential Revision: D60211332
fbshipit-source-id: 73645815dd998da88a0a3731dd0dcad392bf3b96
