RFR: 8073545 - Use shorter and more descriptive names for GC worker threads

[Thomas Schatzl]

Hi,

On Wed, 2015-03-04 at 15:25 +0100, Jesper Wilhelmsson wrote:
> Ok, I don't have a strong opinion. I just wanted to highlight these questions to 
> make sure there was a conscious decision to go with what you suggests :)
> 
> I do think we should try to fit three digit numbers in there though. The whole 
> point of this change is to make the names more usable in the debugger.

  actually I would prefer if we had even more digits to identify them :)
In some cases there already are high three-digit number of threads in
use.

I.e. shorten G1ConcRefine#%d to something like "G1Refine#%d" (or just
remove the "#" because the extra threads for refinement are always used
for concurrent refinement anyway.

I am not insisting on that, just mentioning this potential future
gotcha.

Thanks,
  Thomas