RFR: JDK-8213746: GC/C2 abstraction for C2 matcher

[Roman Kennke]

Thanks Vladimir and Roland for reviewing! I'll push it through
jdk/submit and if successful, to jdk/jdk.

Best regards,
Roman

> +1.
> 
> I verified code refactoring  - looks correct.
> 
> Thanks,
> Vladimir
> 
> On 11/20/18 12:36 AM, Roland Westrelin wrote:
>>
>>> http://cr.openjdk.java.net/~rkennke/JDK-8213746/webrev.01/
>>
>> Looks ok to me.
>>
>> Roland.
>>

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