Under certain circumstances, two cleanup threads can claim and process the same region. Reviewed-by: apetrusenko, ysr
Fixed the incorrect assigment to G1OffsetTableContigSpace::_gc_time_stamp. Also added a little more paranoia to operations on a global timestamp. Reviewed-by: tonyp
First mercurial integration of the code for the Garbage-First garbage collector. Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr