[8u] RFA 8066185: VM crashed with SIGSEGV VirtualMemoryTracker::add_reserved_region

[David Buck]

Hi!

Please approve the backport of the following fix. The change applies 
cleanly after unshuffling.

bug report: https://bugs.openjdk.java.net/browse/JDK-8066185

JDK 9 changeset: http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/37d1442d53bc

original review thread: 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2015-February/031758.html

Cheers,
-Buck