RFR: mmap connection matrix

[Roman Kennke]

Am 22.05.2017 um 11:41 schrieb Aleksey Shipilev:
> Hi,
>
> Currently the connection matrix is allocated in C heap. We can make it
> consistent with marking bitmaps by mmap-ing the matrix as well:
>  http://cr.openjdk.java.net/~shade/shenandoah/matrix-mmap/webrev.01/
>
> Testing: hotspot_gc_shenandoah
>
> -Aleksey
>
It seems ugly that the allocation of the matrix is outside the
ConnectionMatrix class. ShenandoahHeap now needs knowledge about
internals of ConnectionMatrix.

Roman