RFR(S) 8156156: Add module specific NMT MemoryType

[harold seigel]

Hi,

Please review this small change to add a module specific memory type to 
hotspot native memory tracking (NMT).

Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8156156/

Bug: https://bugs.openjdk.java.net/browse/JDK-8156156

The change was tested with an RBT nightly test run, JCK lang and VM 
tests, and UTE non-colocated quick tests.

Thanks, Harold