RFR(XS) 8191931: NMT test for anonymous/delegating metadata space sizing

[Zhengyu Gu]

Hi,

Please review a new gtest to ensure correct sizing for anonymous and 
reflection delegating classloade's metadata space.

Bug: https://bugs.openjdk.java.net/browse/JDK-8191931
Webrev: http://cr.openjdk.java.net/~zgu/8191931/webrev.00/index.html


Thanks,

-Zhengyu