Code review request: 8004802 jcmd VM.native_memory baseline=false crashes VM

[Zhengyu Gu]

This crash is due to that NMT did not check option's value,  only 
checked if the option has value. The fix is to take option value into 
account.

http://cr.openjdk.java.net/~zgu/8004802/webrev.00/


Thanks,

-Zhengyu