hg: shenandoah/jdk8u/hotspot: Fix build without precompiled headers.

[roman at kennke.org]

Changeset: e4c94db92339
Author:    rkennke
Date:      2017-07-27 11:57 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/e4c94db92339

Fix build without precompiled headers.

! src/share/vm/gc_implementation/shenandoah/shenandoahCollectionSet.hpp
! src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegion.cpp
! src/share/vm/gc_implementation/shenandoah/shenandoahRootProcessor.cpp