Improve performance of Reference processing.
By using synchronization on the ReferenceQueue instead of volatile
modifiers, and adding internal support for ReferenceQueue batch
enqueue and remove.
ReferenceBenchmark improvements on hammerhead:
Alloc 250 => 150
AllocAndEnqueue 1060 => 612
AllocEnqueueAndPoll 1300 => 725
AllocEnqueueAndRemove 1350 => 812
AllocImplicitEnqueueAndRemove 7000 => 1758
Finalization 10000 => 6095
Bug: 24404957
Change-Id: I6c3e83f7c34f5c22b001e513b50c932a0d54fd43
4 files changed