[11u] RFR 8200109: NMT: diff_malloc_site assert(early->flags() == current->flags(), "Must be the same memory type")

[zgu at redhat.com]

I would like to backport this patch to 11u. The JDK13 patch does not
apply cleanly, but they are minor conflicts.

Bug: https://bugs.openjdk.java.net/browse/JDK-8200109
JDK13 Webrev: http://cr.openjdk.java.net/~zgu/JDK-8200109/webrev.00/
JDK13 code review: https://mail.openjdk.java.net/pipermail/hotspot-runt
ime-dev/2019-February/032463.html

JDK11u Webrev: http://cr.openjdk.java.net/~zgu/JDK-8200109-11u/webrev.0
0/

Test:
  hotspot_nmt on Linux x64(fastdebug and release)

Thanks,

-Zhengyu