Summary:
We always run consistency checks when compiling in debug mode
allow users to set Options::force_consistency_checks to true to be able to run such checks even when compiling in release mode

Test Plan:
make check -j64
make release

Reviewers: lightmark, sdong, yiwu

Reviewed By: yiwu

Subscribers: hermanlee4, andrewkr, yoshinorim, jkedgar, dhruba

Differential Revision: https://reviews.facebook.net/D64701