NEW 121239
IncrementalSweeper should not require an entire Vector to do its job 
https://bugs.webkit.org/show_bug.cgi?id=121239
Summary IncrementalSweeper should not require an entire Vector to do its job
Mark Hahnenberg
Reported 2013-09-12 10:55:37 PDT
Right now during every collection we fill a Vector with pointers to all the MarkedBlocks in the Heap just so the IncrementalSweeper can iterate over them later without getting confused about newly added blocks. This is too expensive to do during every GC, especially with a generational collector. We should instead create a special iterator that the IncrementalSweeper can use that iterates the blocks in place and handles any weird corner cases internally.
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