hg: jdk/sandbox: 8243200: Shenandoah: Allow concurrent nmethod iteration

[chris.hegarty at oracle.com]

Changeset: e4f8d17d1951
Author:    zgu
Date:      2020-04-22 17:10 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/e4f8d17d1951

8243200: Shenandoah: Allow concurrent nmethod iteration
Reviewed-by: rkennke, shade

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