treadle.utils
Workaround for https://github.com/freechipsproject/firrtl/issues/498 from @jackkoenig
(Since version FIRRTL 1.3) Due to confusion, 'dependents' is being renamed to 'optionalPrerequisiteOf'. Override the latter instead.
(Since version 1.1) Just collect the actual Annotation types the transform wants
Workaround for https://github.com/freechipsproject/firrtl/issues/498 from @jackkoenig