[8u-dev] RFA: 6651256: jstack: DeleteGlobalRef method call doesn't lead to descreasing of global refs count shown by jstack

[David Buck]

Hi!

Please approve the backport of this small serviceability fix to 8u-dev. 
The JDK 9 patch applies cleanly as-is to the 8u-dev forest.

bug report:
https://bugs.openjdk.java.net/browse/JDK-6651256

jdk 9 changeset:
http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/ab67ce0bfae2

jdk 9 review thread:
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2014-January/010667.html

I have manually tested the fix against the testcase attached to the bug 
report. Default and hotspot jprt testsets also run and passed.

Cheers,
-Buck