RFR: 8140508: Add utility method for logging phases to G1CollectorPolicy

[Erik Helin]

All,

small update based on offline discussion between me and Thomas:
- make G1GCPhaseTimes::note_gc_end private and call it from
  G1GCPhaseTimes::print. note_gc_end must always be called before print,
  so it makes sense to just call it from print.
- Rename G1CollectorPolicy::log_phases to
  G1CollectorPolicy::print_phases, since "print" is more frequently used
  than "log" in the G1 code.

Please see new webrev:
http://cr.openjdk.java.net/~ehelin/8140508/webrev.01/

Thanks,
Erik

On 2015-10-27, Erik Helin wrote:
> Hi all,
> 
> this small patch just adds a small utility method to G1CollectorPolicy,
> log_phases.
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8140508
> 
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8140508/webrev.00/
> 
> Testing:
> JPRT
> 
> Thanks,
> Erik