RFR (S): Move shenandoah oop CAS to MacroAssembler

[Roman Kennke]

Am Montag, den 26.09.2016, 14:12 +0200 schrieb Aleksey Shipilev:
> Hi,
> 
> Please review this change, which moves OOP CAS from .ad to
> MacroAssembler, documents, and optimizes it a little:
>   http://cr.openjdk.java.net/~shade/shenandoah/c2-cas-macroasm/webrev
> .01/
> 
> Testing: hotspot/gc/shenandoah, jcstress (test-custom)

Looks ok to me too.

I'm waiting for somebody to record you as Shenandoah committer... if it
doesn't happen today, I'll push that change, is that ok?

Roman