RFR (M): 8136681: Factor out IHOP calculation from G1CollectorPolicy

[Thomas Schatzl]

Hi Mikael,

On Mon, 2015-11-23 at 14:27 +0100, Mikael Gerdin wrote:
> Thomas,
> 
[...]
> Since you decided to remove "size_t rs_size = ..." from 
> record_collection_pause_end you get to remove the assert on the line 
> above since it refers to the subtraction you just removed.
> And now it appears that all uses of 
> _cur_collection_pause_used_regions_at_start are gone and you can remove 
> it altogether!
> 
> I don't need to see a webrev with the additional removals.
> 
> I think this is ready to go in now, Reviewed.

  removed the suggested member variable. Thanks.

Thanks for the reviews,
  Thomas