RFR: [9] 2018-02-20: Bulk backports to sh/jdk9

[Roman Kennke]

Looks good!

On Tue, Feb 20, 2018 at 11:34 AM, Aleksey Shipilev <shade at redhat.com> wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk9-20180220/webrev.01/
>
> This backports a small chunk of cleanups and bugfixes to sh/jdk9:
>
> 30b431d17fcc: [backport] ShenandoahWriteBarrierNode::find_bottom_mem() fix
> 8cd5e3a78fea: [backport] Move barriers into typeArrayOop.hpp direct memory accessors
> 80cdb1b94399: [backport] Roots verification should take the special roots first
> b5a09ff17768: [backport] LotsOfCycles test timeouts
> ab9dd1d11dc1: [backport] Protect C2 matchers with UseShenandoahGC
>
> Testing: hotspot_gc_shenandoah {fastdebug|release}
>
> Thanks,
> -Aleksey
>