RFR(XXS): 8199752: NMT: Memory allocated by Unsafe.allocateMemory should be tagged as mtOther

[Zhengyu Gu]

Hi All,

Please review this trivial change. mtOther is the category for memory 
allocation *not* by JVM.

Bug: https://bugs.openjdk.java.net/browse/JDK-8199752
Webrev: http://cr.openjdk.java.net/~zgu/8199752/webrev.00/index.html


Test:
   hotspot_runtime on Linux 64


Thanks,

-Zhengyu