8004687: G1: Parallelize object self-forwarding and scanning during an evacuation failure Summary: Use the regular task queue during evacuation failure and allow per-thread preserved header queues to remove the global lock during evacuation failure. Reviewed-by: mgerdin, jmasa Contributed-by: Walter Florian Gugenberger <walter.gugenberger@gmail.com>

8131319: Move G1Allocator::_summary_bytes_used back to G1CollectedHeap Summary: G1Allocator::_summary_bytes_used fits better in G1CollectedHeap since we added the archive allocator. Move it back to the original location. Reviewed-by: mgerdin, tbenson