RFR: JDK-8213384: Move G1/C2 barrier verification into G1BarrierSetC2

[Roman Kennke]

Thanks, Vladimir, for the review!

Roman

> Compiler change looks fine.
> 
> Thanks,
> Vladimir
> 
> On 11/5/18 11:59 AM, Roman Kennke wrote:
>>
>> Compile::verify_barriers() exists and is implemented only to verify G1's
>> SATB barriers. Meanwhile, we have BarrierSetC2::verify_gc_barriers() API
>> that should be used instead.
>>
>>
>> This change proposes to remove Compile::verify_barriers() and replace
>> its uses by BarrierSetC2::verify_gc_barriers(). In order to do so, I
>> changed verify_gc_barriers() to take an enum (instead of bool) that
>> describes the current phase, this will scale better in future should we
>> ever want more verification points, and it reads better. Plus we now
>> pass a Compile* to get the context.
>>
>> The new code in G1BarrierSetC2::verify_gc_barriers() is basically a 1:1
>> copy of the previous Compile::verify_barriers().
>>
>> I tried to make the changes in ZBarrierSetC2 equivalent to what it did
>> before:
>> - Don't verify in new phase BeforeCodeGen (not sure if needed/wanted)
>> - Redirect virtual verify_gc_barriers() to existing (now private)
>> verify_gc_barriers(), that is also used by ZBarrierSetC2 itself and
>> doesn't have a Compile* there.
>>
>> Bug:
>> https://bugs.openjdk.java.net/browse/JDK-8213384
>> Webrev:
>> http://cr.openjdk.java.net/~rkennke/JDK-8213384/webrev.01/
>>
>> Can I please get a review?
>>
>> Thanks,
>> Roman
>>

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