RFR: Consolidate assembly write barriers

[Aleksey Shipilev]

On 07/09/2018 08:08 PM, Roman Kennke wrote:
>>     // The set of registers to be saved+restored is the same as in the write-barrier above.
>>     // Those are the commonly used registers in the interpreter.
> 
> The write-barrier goes through the stub, which saves the registers.

Ah! Okay then.

> Remaining patch:
> http://cr.openjdk.java.net/~rkennke/shenandoahwb/webrev.01/

Looks good.

-Aleksey