Implement shrinking of paged spaces during sweeping.
For each paged space we release all but one of the unused pages after marking (when we know the number of live bytes) but before actually sweeping it. This is not yet done for lazy swept pages. R=erik.corry@gmail.com BUG=v8:1614 Review URL: http://codereview.chromium.org/7891010 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9481 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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