[8u] Request for approval and review: 8075805: Crash while trying to release CompiledICHolder

[Tobias Hartmann]

Hi,

please approve and review the following backport to 8u.

8075805: Crash while trying to release CompiledICHolder
https://bugs.openjdk.java.net/browse/JDK-8075805
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/c0ea5537dc8b
http://cr.openjdk.java.net/~thartmann/8075805/webrev.01/

I would also like to backport this follow up change that fixes an issue with the fix for 8075805:

8134493: Cleaning inline caches of unloaded nmethods should be done in sweeper
https://bugs.openjdk.java.net/browse/JDK-8134493
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/9df4555d2d7d
http://cr.openjdk.java.net/~thartmann/8134493/webrev.01/

Unfortunately, both changesets do not apply cleanly to 8u. I merged the fixes, here are the new webrevs:

JDK-8075805:
http://cr.openjdk.java.net/~thartmann/8075805_8u/webrev.00/

JDK-8134493 (incremental):
http://cr.openjdk.java.net/~thartmann/8134493_8u/webrev.00/

Both changes:
http://cr.openjdk.java.net/~thartmann/8075805_8134493_8u/webrev.00/

Both fixes were pushed some months ago and testing showed no problems.

Thanks,
Tobias