RFR: Disable matrix for good when -UseShenandoahMatrix

[Aleksey Shipilev]

On 03/24/2017 06:39 PM, Roman Kennke wrote:
> Can we avoid clearing the bitmap if we don't need it and the
> clear_all()/internal_clear_all() distinction?

Yes we can, like this?

  39   if (UseShenandoahMatrix) {
  40     clear_all();
  41   }

 http://cr.openjdk.java.net/~shade/shenandoah/matrix-disable-for-good/webrev.02/

Thanks,
-Aleksey