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To get reproducible/deterministic builds, the way that the Uniques are assigned shouldn't matter. This allows to test for that. It add 2 new flags: * `-dinitial-unique` * `-dunique-increment` And by varying these you can get interesting effects: * `-dinitial-unique=0 -dunique-increment 1` - current sequential UniqSupply * `-dinitial-unique=16777215 -dunique-increment -1` - UniqSupply that generates in decreasing order * `-dinitial-unique=1 -dunique-increment PRIME` - where PRIME big enough to overflow often - nonsequential order I haven't proven the usefullness of the last one yet and it's the reason why we have to mask the bits with `0xFFFFFF` in `genSym`, so I can remove it if it becomes contentious. Test Plan: validate on harbormaster Reviewers: simonmar, austin, ezyang, bgamari Reviewed By: austin, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1360 GHC Trac Issues: #4012
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