propagate hints in predicates_of_condition
propagate hints in predicates_of_condition

Summary:
Adds a `hint` label to `predicates_of_condition` to ensure hints are
propagated to each part of the condition. The respective functionality
is already implemented in name_def.ml (see calls to `visit_conditional` and
`visit_logical_expression`).

Changelog: [internal]

Reviewed By: SamChou19815

Differential Revision: D38597302

fbshipit-source-id: cad8fe196e0dadbd8fc9ca2f472ae7a2063eba82

facebook/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow,mroch/flow