Add debug logic to c2_ref_test and its helpers (#19359)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19359
Even with file IO exception handling, some of the sandcastle c2_ref_tests are still failing in length-check assert, as can be seen here:
https://our.intern.facebook.com/intern/test/844424932589974?ref_report_id=0
This is an attempt to add printing logic to debug what's going on.
Reviewed By: dzhulgakov
Differential Revision: D14966274
fbshipit-source-id: adce6d4780d664c5ef59f9341b6133b0d09324cb
