hg: jdk/sandbox: 8219857: Shenandoah GC may initialize thread's gclab twice

[chris.hegarty at oracle.com]

Changeset: 235b0e817c32
Author:    zgu
Date:      2019-02-28 08:44 -0500
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/235b0e817c32

8219857: Shenandoah GC may initialize thread's gclab twice
Reviewed-by: rkennke

! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
! src/hotspot/share/gc/shenandoah/shenandoahThreadLocalData.hpp