hg: jdk/sandbox: 8241793: Shenandoah: Enable concurrent class unloading for aarch64

[chris.hegarty at oracle.com]

Changeset: e81653c0542d
Author:    zgu
Date:      2020-04-30 14:00 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/e81653c0542d

8241793: Shenandoah: Enable concurrent class unloading for aarch64
Reviewed-by: smonteith, rkennke

! src/hotspot/share/gc/shenandoah/shenandoahConcurrentRoots.cpp
! test/hotspot/jtreg/gc/stress/gcbasher/TestGCBasherWithShenandoah.java