RFR: 8149128: Add tests for G1MMUTracker

[Kim Barrett]

> On May 24, 2016, at 11:09 AM, Erik Helin <erik.helin at oracle.com> wrote:
> 
> Hi all,
> 
> we have a new shiny unit test framework so I figured I would take it for
> a spin. I added some new tests for G1MMUTracker, see below. If you want
> to try out the new test runner, just apply the patch, then:
> 
>  $ make test-hotspot-gtest
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8149128
> 
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8149128/00/
> 
> Testing:
> - JPRT
> - Running locally on Linux x86-64
> 
> Thanks,
> Erik
> 
> PS. I don't really how if the feature complete applies to tests?

------------------------------------------------------------------------------
I find it quite confusing to have a class called ms that constructs
from a millisecond time, but implicitly converts to double seconds.

------------------------------------------------------------------------------ 
The following (convenience) functions are untested.
when_max_gc_sec
when_max_gc_ms
when_ms

------------------------------------------------------------------------------