Tidy up and consolidate canned CmmReg and CmmGlobals
Test Plan: validate Reviewers: bgamari, erikd Reviewed By: bgamari Subscribers: rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4380
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Test Plan: validate Reviewers: bgamari, erikd Reviewed By: bgamari Subscribers: rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4380