RFR: 8217474: Remove WhiteBox.getConcurrentGCPhases()

[Kim Barrett]

> On Jan 22, 2019, at 2:43 PM, Aleksey Shipilev <shade at redhat.com> wrote:
> 
> On 1/22/19 8:39 PM, Kim Barrett wrote:
>> Please review this change to remove a not really useful test and the
>> assocated infrastructure.  The test really doesn't carry its weight.
>> 
>> This is a step toward improving the WhiteBox control of concurrent
>> collection cycles, to make it more amenable for use by ZGC too.
>> 
>> [I'll update copyrights before pushing.]
>> 
>> CR:
>> https://bugs.openjdk.java.net/browse/JDK-8217474
>> 
>> Webrev:
>> http://cr.openjdk.java.net/~kbarrett/8217474/open.00/
> 
> Yes, please. I was scratching my head if/how to adapt this to Shenandoah, but decided it was not
> worth it. The patch looks good.
> 
> -Aleksey

Thanks.

There are more changes coming.  This one is just getting rid of some deadwood to
make later changes smaller and more focused.  The goal is to have something that
all of G1, Z, and Shenandoah can use without too much head scratching.