8146093: [sparc only] compiler/interpreter/7116216/StackOverflow.java Program terminates with signal 11, Segmentation fault. in __1cLRegisterMap2t6MpnKJavaThread_b_v_ ()
Reviewed-by: dcubed, coleenp
8152182: Possible overflow in initialzation of _rescan_task_size and _marking_task_size
Summary: Add constraints for CMSRescanMultiple and CMSConcMarkMultiple flags
Reviewed-by: jwilhelm, jmasa