[8u] RFA 8184991: NMT detail diff should take memory type into account

[Zhengyu Gu]

I would like to request a backport of this fix:

Bug: https://bugs.openjdk.java.net/browse/JDK-8184991
Changeset: http://hg.openjdk.java.net/jdk10/jdk10/hotspot/rev/a84056f3eed1
Review: 
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2017-July/023988.html

The patch applied cleanly with file path changes.

Thanks,

-Zhengyu