6792421: assert(_bitMap->isMarked(addr+size-1),inconsistent Printezis mark) Summary: The CMS concurrent precleaning and concurrent marking phases should work around classes that are undergoing redefinition. Reviewed-by: ysr, tonyp

6787254: Work queue capacity can be increased substantially on some platforms Summary: Increased the default and maximum size of the CMS marking stack and the size of the parallel workers' work queues in 64-bit mode. The latter was accomplished by an increase in the width of the Taskqueue's Age struct and its Tag field in 64-bit mode. Reviewed-by: jmasa, tonyp