Summary: NMT value objects should use VALUE_OBJ_CLASS_SPEC instead of deriving from _ValueObj
Reviewed-by: coleenp, hseigel, dholmes

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

8003487: NMT: incorrect assertion in VMMemPointerIterator::remove_released_region method (memSnapshot.cpp)
Summary: The assertion is applied to only the region to be released, also performs region integrity checking
Reviewed-by: acorn, coleenp

Summary: Fixed NMT that miscounted arena memory when it is used as value or stack object.
Reviewed-by: acorn, coleenp

Summary: Enhanced virtual memory tracking to track committed regions as well as reserved regions, so NMT now can generate virtual memory map.
Reviewed-by: acorn, coleenp

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