hg: shenandoah/jdk: Fix PLAB alignment reserve

[roman at kennke.org]

Changeset: 58708ff8795b
Author:    rkennke
Date:      2018-05-16 00:16 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk/rev/58708ff8795b

Fix PLAB alignment reserve

! src/hotspot/share/gc/shared/plab.cpp
! src/hotspot/share/gc/shared/plab.hpp
! src/hotspot/share/gc/shenandoah/shenandoahThreadLocalData.hpp