hg: shenandoah/jdk10: [backport] overflow integer during size calculation

[roman at kennke.org]

Changeset: 245b02119412
Author:    zgu
Date:      2018-06-19 10:37 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/245b02119412

[backport] overflow integer during size calculation

! src/hotspot/share/gc/shenandoah/shenandoahConcurrentMark.inline.hpp