RFR: Add diagnostic flag to disable inline assembler write barrier

[Roman Kennke]

Am 31.08.2017 um 19:33 schrieb Aleksey Shipilev:
> On 08/31/2017 07:15 PM, Roman Kennke wrote:
>> This patch adds a (diagnostic) flag to disable the inline assembler
>> write barrier code. This should enable to measure the performance impact
>> of it.
>>
>> http://cr.openjdk.java.net/~rkennke/disableasmwb/webrev.00/
> 
> We should avoid "Disable" options that yield double negations like -XX:-ShenandoahDisableAsmWB.
> Otherwise seems fine.
> 
> Thanks,
> -Aleksey
> 

Right. Like this?

http://cr.openjdk.java.net/~rkennke/disableasmwb/webrev.01/

Roman