RFR: Add missing SBSA::resolve() to AArch64 ShBarrierSetAssembler

[Aleksey Shipilev]

On 09/10/2018 02:39 PM, Roman Kennke wrote:
> We're lacking the ShBSA::resolve() in AArch64 and that is responsible
> for some of the failures we see in AArch64.
> 
> http://cr.openjdk.java.net/~rkennke/aarch64-resolve/webrev.00/

Looks good.

-Aleksey