hg: shenandoah/jdk8/hotspot: Shenandoah: JvmtiExport::weak_oops_do should not be entered by multiple threads

[shade at redhat.com]

Changeset: a56f86355f8d
Author:    shade
Date:      2019-10-31 12:50 +0100
URL:       https://hg.openjdk.java.net/shenandoah/jdk8/hotspot/rev/a56f86355f8d

Shenandoah: JvmtiExport::weak_oops_do should not be entered by multiple threads

! src/share/vm/gc_implementation/shenandoah/shenandoahRootProcessor.cpp