RFR: Fast matrix math & inlining

[Aleksey Shipilev]

On 03/17/2017 06:06 PM, Roman Kennke wrote:
> http://cr.openjdk.java.net/~rkennke/matrixmath/webrev.00/

Very nice.

 *) We need to either move the comment from GraphKit to
ShenandoahConnectionMatrix about the math, or reference it otherwise. I would
prefer it moved to SCMatrix, and then GraphKit to mention "look at SCMatrix for
rationale".

 *) shenandoahHeap.inline.hpp: redundant to_idx

 245       uint to_idx = _heap->heap_region_index_containing(obj);
 246       _matrix->set_connected(o, obj);

 *) shenandoahHeap.inline.hpp: redundant from_idx

 355     uint from_idx = heap_region_index_containing(copy_val);
 356     UpdateMatrixClosure cl;

Thanks,
-Aleksey