hg: jdk/sandbox: 8245124: Shenandoah: optimize code root evacuation/update during concurrent class unloading

[chris.hegarty at oracle.com]

Changeset: b78256118358
Author:    zgu
Date:      2020-05-18 14:47 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/b78256118358

8245124: Shenandoah: optimize code root evacuation/update during concurrent class unloading
Reviewed-by: shade

! src/hotspot/share/gc/shenandoah/shenandoahCodeRoots.cpp
! src/hotspot/share/gc/shenandoah/shenandoahNMethod.cpp
! src/hotspot/share/gc/shenandoah/shenandoahNMethod.hpp
! src/hotspot/share/gc/shenandoah/shenandoahNMethod.inline.hpp