hg: shenandoah/jdk8u/hotspot: [backport] overflow integer during size calculation

[roman at kennke.org]

Changeset: eef4ccd8af8b
Author:    zgu
Date:      2018-06-19 10:37 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/eef4ccd8af8b

[backport] overflow integer during size calculation

! src/share/vm/gc_implementation/shenandoah/shenandoahConcurrentMark.inline.hpp