hg: shenandoah/jdk: Cherry-pick: 8230401: ClassLoaderData::_keep_alive is read with wrong type in c2i entry barrier

[zgu at redhat.com]

Changeset: ea686a5ec33c
Author:    eosterlund
Date:      2019-09-04 15:05 +0200
URL:       https://hg.openjdk.java.net/shenandoah/jdk/rev/ea686a5ec33c

Cherry-pick: 8230401: ClassLoaderData::_keep_alive is read with wrong type in c2i entry barrier
Reviewed-by: zgu, tschatzl, iklam

! src/hotspot/share/classfile/classLoaderData.hpp