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While we have always had makeDynFlagsConsistent to enforce a variety of consistency invariants on DynFlags, it hasn't been widely used. GHC.Main, for instance, ignored it entirely. This leads to issues like Trac #10549, where an OPTIONS_GHC pragma introduced an inconsistency, leading to a perplexing crash later in compilation. Here I add consistency checks in GHC.Main.set{Session,Program}DynFlags, closing this hole. Fixes #10549. Test Plan: Validate with T10549 Reviewers: austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1128 GHC Trac Issues: #10549
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