hg: shenandoah/jdk10/hotspot: Factor out keep alive barriers in aarch64.

[roman at kennke.org]

Changeset: 49d529af1237
Author:    rkennke
Date:      2017-09-08 11:23 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/hotspot/rev/49d529af1237

Factor out keep alive barriers in aarch64.

! src/cpu/aarch64/vm/macroAssembler_aarch64.cpp
! src/cpu/aarch64/vm/macroAssembler_aarch64.hpp
! src/cpu/aarch64/vm/templateInterpreterGenerator_aarch64.cpp