hg: shenandoah/jdk8u/hotspot: [backport] Parallel code cache scanning

[ashipile at redhat.com]

Changeset: dcdf681fc866
Author:    shade
Date:      2017-05-10 14:20 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/dcdf681fc866

[backport] Parallel code cache scanning

! src/share/vm/code/codeCache.cpp
! src/share/vm/code/codeCache.hpp
! src/share/vm/gc_implementation/shenandoah/shenandoahRootProcessor.cpp
! src/share/vm/gc_implementation/shenandoah/shenandoahRootProcessor.hpp