hg: shenandoah/jdk10: Fix ciInstanceKlass::ensure_metadata_alive for Shenandoah

[ashipile at redhat.com]

Changeset: aacfac658e16
Author:    shade
Date:      2018-04-09 17:59 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/aacfac658e16

Fix ciInstanceKlass::ensure_metadata_alive for Shenandoah

! src/hotspot/share/ci/ciInstanceKlass.cpp