RFR (XS): 8u40 Backport of 8038423: G1: Decommit memory within the heap

[Thomas Schatzl]

Hi Bengt,

On Wed, 2014-08-20 at 09:01 +0200, Bengt Rutisson wrote:
> Hi Thomas,
> 
> Merge looks good.
> 
> The four new files (g1PageBasedVirtualSpace.cpp/hpp and 
> g1RegionToSpaceMapper.cpp/hpp) are missing from the backport webrev. 
> Don't forget to 'hg add' them before you push ;) No need for a new review.
> 

Thanks for the review. I won't miss that, and compilation will fail
anyway during pushing - but sorry for the oversight.

Thanks,
Thomas