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Rename to whitehole_gc_spin, in preparation for adding stats for the whitehole busy-loop in SMPClosureOps. Make whitehole_gc_spin volatile, and move it to be defined and statically initialised in GC.c. This saves some #ifs, and I'm pretty sure it should be volatile. Test Plan: ./validate Reviewers: bgamari, erikd, simonmar Reviewed By: bgamari Subscribers: rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4300
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