Include -fwarn-star-is-type in -Wcompat

Authored by int-index on Oct 12 2018, 10:15 AM.

Description

Include -fwarn-star-is-type in -Wcompat

According to the deprecation schedule in the accepted proposal,
the first step is to include -fwarn-star-is-type in -Wcompat.

Test Plan: Validate

Reviewers: bgamari

Reviewed By: bgamari

Subscribers: rwbarton, carter

GHC Trac Issues: Trac #15476

Differential Revision: https://phabricator.haskell.org/D5044