Merge revision 9585 and revision 9580 to trunk.

Merge revision 9585 and revision 9580 to trunk.

Revision 9585:
Fix free list node ending up on evacuation candidate.

This is a temporary fix which avoids compaction when incremental marking
is restarted during an old-space-step. That could turn the page that
holds the chosen free list node into an evacuation candidate. It could
also cause several other inconsistencies if it happens during scavenge.

Revision 9580:
Adjust assertions in the incremental marking.

Now we are completely transfering marks when shifting arrays in-place.

This might lead to white free space objects in the marking deque.
Committed: http://code.google.com/p/v8/source/detail?r=9586

[Vyacheslav Egorov (Chromium), 2011-10-11 17:32:17]

lgtm if compiles