hg: jdk/sandbox: 8213148: JDK build fails because of missing #includes

[chris.hegarty at oracle.com]

Changeset: 16950b2eaebf
Author:    hseigel
Date:      2018-10-30 09:13 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/16950b2eaebf

8213148: JDK build fails because of missing #includes
Summary: Add missing #includes
Reviewed-by: dcubed

! test/hotspot/gtest/memory/test_metaspace.cpp