8010151: nsk/regression/b6653214 fails "assert(snapshot != NULL) failed: Worker should not be started"
Summary: Fixed a racing condition when shutting down NMT while worker thread is being started, also fixed a few mis-declared volatile pointers.
Reviewed-by: dholmes, dlong

Summary: Add WB API functions to enable better NMT testing
Reviewed-by: dholmes, zgu

Summary: Count number of instance classes so that it matches class metadata size
Reviewed-by: coleenp, acorn

7181995: NMT ON: NMT assertion failure assert(cur_vm->is_uncommit_record() || cur_vm->is_deallocation_record
Summary: Fixed virtual memory records merge and promotion logic, should be based on sequence number vs. base address order
Reviewed-by: coleenp, acorn

7187429: NMT ON: Merge failure should cause NMT to shutdown
Summary: Fixed NMT assertion failures
Reviewed-by: acorn, kvn

7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain