hg: shenandoah/jdk8u/hotspot: Remove unused memory_for, fixing the build

[ashipile at redhat.com]

Changeset: a42ad52a3ac6
Author:    shade
Date:      2017-08-08 23:22 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/a42ad52a3ac6

Remove unused memory_for, fixing the build

! src/share/vm/opto/shenandoahSupport.cpp