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

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

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

8001591: NMT: assertion failed: assert(rec->addr() + rec->size() <= cur->base()) failed: Can not overlap in memSnapshot.cpp
Summary: NMT should allow overlapping committed regions as long as they belong to the same reserved region
Reviewed-by: dholmes, 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

7191124: Optimized build is broken due to inconsistent use of DEBUG_ONLY and NOT_PRODUCT macros in NMT
Summary: Updated all related variables and methods to use NOT_PRODUCT macros
Reviewed-by: coleenp, 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