RFR: 8184914: Use MacroAssembler::cmpoop() consistently when comparing heap objects

[Roman Kennke]

Am 23.10.2017 um 14:30 schrieb coleen.phillimore at oracle.com:
>
>
> On 10/23/17 8:21 AM, Roman Kennke wrote:
>> Hi Coleen,
>>
>> thank you. Can you sponsor it? Do you need anything from me?
>
> I do not.  I'll push it now.  I'm curious why you didn't change any of 
> the other platforms.  Or do you only need this for x86?
> thanks,
> Coleen
x86 seemed most important for now because there was this odd discrepancy 
between 32 and 64 bit (cmpoop did exist before, but only for one special 
case in 32 bit). I will do something similar for aarch64 later (need it 
for Shenandoah). Others will have to fill in the required parts for 
Shenandoah to other platforms, if they need it.

Thanks for all your help!

Roman