[8u] Request for approval for CR 8138966 - Intermittent SEGV running ParallelGC

[Thomas Schatzl]

Hello,

  can I have approval for the backport of JDK-8138966: Intermittent SEGV
running ParallelGC.

This issue fixes crashes on non-TSO platforms with parallel GC by adding
necessary memory barriers (which are NOPs on TSO platforms).

CR:
https://bugs.openjdk.java.net/browse/JDK-8138966

JDK9 - Review thread link:
http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2015-October/015161.html

JDK8u - Review thread link:
n/a. Applies cleanly apart from path changes in the patch. This was due
to directory restructuring in JDK9 that is unrelated to this change.

JDK9 changeset link:
http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/d5e5e9f4fc04 (pushed
into group repos 11/04)

(JDK8u webrev for completeness)
http://cr.openjdk.java.net/~aph/8138966/jdk8/

Thanks,
  Thomas