CMS parallel initial mark

[Hiroshi Yamauchi]

> - in the CMSCollector::CMSCollector() initialization list, the
> initialization of _eden_chunk_sampling_active breaks the "-- ditto --"
> list, which looks strange. (Actually I think the comment that a variable
> may eventually be set in the ctor again later seems questionable anyway)
>

Right. It could be moved below _survivor_chunk_index so it won't interrupt
the "-- ditto --" list. Or, it could be moved above the list along with its
declaration in the .hpp file. But let's hold off until the try_lock
discussion develops.
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