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Various non-moving GC fixes

Ben Gamari requested to merge wip/gc/fix-bitmap-clear into master

A few minor improvements and one significant bug fix:

  • Ensure that we set the segment size before zeroing the segment bitmap (fixing a potential soundness issue)
  • Memoize the block count to avoid relying on optimisation to do the same
  • Eagerly flush the update remembered sets of all capabilities during minor GCs
Edited by Ben Gamari

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