hg: jdk/sandbox: 8202772: NMT thread stack tracking causes crashes on AIX

[chris.hegarty at oracle.com]

Changeset: e1b3def12624
Author:    stuefe
Date:      2018-06-13 06:35 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/e1b3def12624

8202772: NMT thread stack tracking causes crashes on AIX
Reviewed-by: goetz, zgu

! src/hotspot/share/services/memTracker.hpp
! test/hotspot/gtest/runtime/test_committed_virtualmemory.cpp