RFR: 8224816: Provide os::processor_id() implementation for Mac OS

[Robbin Ehn]

Hi Erik,

> New webrev:
> http://cr.openjdk.java.net/~eosterlund/8224816/webrev.01/

Looks good.

/Robbin

> 
> Incremental:
> http://cr.openjdk.java.net/~eosterlund/8224816/webrev.00_01/
> 
> Thanks,
> /Erik
> 
>> cheers,
>> /Per
>>
>>>
>>> Thanks,
>>> /Erik
>