Discontiguous mark compact space support #939
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…/mmtk-core into discontig-mark-compact
tianleq
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#939 makes MarkCompact GC allocate large objects into LOS, instead of mark-compacting everything. However, LOS should be released and re-prepared properly, otherwise marking in the pointer forwarding trace will not behave correctly. This should fix the OpenJDK binding test failures.
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This PR adds discontiguous heap support for mark compact GC, and rewrites the forwarding pointer calculation and compaction code to be compactable to both contiguous and discontiguous spaces.
Fixes #930