hg: jdk9/hs/hotspot: 8156929: [aix] Add missing includes

[david.holmes at oracle.com]

Changeset: 79d6d3def569
Author:    goetz
Date:      2016-05-17 03:26 -0400
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/79d6d3def569

8156929: [aix] Add missing includes
Reviewed-by: coleenp, dholmes

! src/share/vm/gc/g1/g1HeapSizingPolicy_ext.cpp
! src/share/vm/runtime/mutex.cpp