RFR [jdk11]: 8216541: CompiledICHolders of VM locked unloaded nmethods are released too late

[Baesken, Matthias]

Hello , please review  the jdk11  backport  of  8216541: CompiledICHolders of VM locked unloaded nmethods are released too late  .
I had to do a few small adjustments because  the patch does not apply cleanly .


Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8216541

http://cr.openjdk.java.net/~mbaesken/webrevs/8216541_jdk11_0/


change from jdk12 was :

http://hg.openjdk.java.net/jdk/jdk12/rev/0331b08811ad


Thanks, Matthias