[8u] Request for approval: Backport of 8161147, 8162603

[Tobias Hartmann]

Hi,

please approve the following backports to JDK 8u.

8161147: jvm crashes when -XX:+UseCountedLoopSafepoints is enabled
https://bugs.openjdk.java.net/browse/JDK-8161147
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/286ad75013e2
http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-July/023700.html

And the follow up test fix:

8162603: Unrecognized VM option 'UseCountedLoopSafepoints'
https://bugs.openjdk.java.net/browse/JDK-8162603
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/40b4cb7908a1
http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-July/023915.html

Both fixes were pushed to JDK 9 months ago and showed no problems. The patches apply cleanly to JDK 8u.

Thanks,
Tobias