RFR: 8012464 NMT: classes should not derive from _ValueObj, use VALUE_OBJ_CLASS_SPEC instead

[Zhengyu Gu]

A simple change to replace some of NMT classes' base class from 
_ValueObj to VALUE_OBJ_CLASS_SPEC, as some compilers generate bigger 
binaries than necessary.

bug: https://jbs.oracle.com/bugs/browse/JDK-8012464
public bug: not available
webrev:http://cr.openjdk.java.net/~zgu/8012464/webrev.00/ 
<http://cr.openjdk.java.net/%7Ezgu/8012464/webrev.00/>


Thanks,

-Zhengyu
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