RFR: 8217474: Remove WhiteBox.getConcurrentGCPhases()

[Thomas Schatzl]

Hi,

On Tue, 2019-01-22 at 14:39 -0500, 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/
> 
> Testing:
> mach5 tier1, which includes running the tests in
> jtreg/gc/concurrent_phase_control.
> 
> 

  looks good.

Thomas