hg: jdk/sandbox: 8242216: ObjectSampler::weak_oops_do() should not trigger barrier

[chris.hegarty at oracle.com]

Changeset: e1f0f9e80d16
Author:    zgu
Date:      2020-04-07 10:43 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/e1f0f9e80d16

8242216: ObjectSampler::weak_oops_do() should not trigger barrier
Reviewed-by: rkennke, eosterlund

! src/hotspot/share/jfr/leakprofiler/sampling/objectSample.cpp
! src/hotspot/share/jfr/leakprofiler/sampling/objectSample.hpp
! src/hotspot/share/jfr/leakprofiler/sampling/objectSampler.cpp