RFR: C1 barriers modularization aarch64 changes

[Aleksey Shipilev]

On 06/05/2018 04:37 PM, Roman Kennke wrote:
> This implements the missing stuff for C1 barriers modularization for
> aarch64. It also includes a few minor/trivial touchups in the x86 code
> that I made on the way.
> 
> http://cr.openjdk.java.net/~rkennke/c1-barriers-aarch64/webrev.00/
> 
> Test: tier3_gc_shenandoah ok
> 
> Good?

OK, good.

-Aleksey