Require GHC 8.2 to bootstrap GHC
Require GHC 8.2 to bootstrap GHC

Reviewers: bgamari, hvr, RyanGlScott

Reviewed By: RyanGlScott

Subscribers: RyanGlScott, rwbarton, thomie, erikd, carter

Differential Revision: https://phabricator.haskell.org/D4509

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