[8u] RFR: 8058563: InstanceKlass::_dependencies list isn't cleared from empty nmethodBucket entries

[Stefan Karlsson]

Hi all,

Please review this backport of 8058563 from JDK 9 to JDK 8u.

JBS:
  https://bugs.openjdk.java.net/browse/JDK-8058563

JDK 8u patch:
  http://cr.openjdk.java.net/~stefank/backports/8u/8058563/webrev.01/

JDK 9 patch:
  http://cr.openjdk.java.net/~stefank/8058563/webrev.01/

The description of the fix can be found at:
  http://mail.openjdk.java.net/pipermail/hotspot-dev/2015-October/020253.html

The nmethod code was refactored in JDK 9, which made it possible to 
easily write unit tests for theses changes. Since I don't want to do 
this refactoring for JDK 8u, the patch is slightly different and the 
unit tests are not included.

Thanks,
StefanK