RFR 8146991: Introduce per-worker preserved mark stacks in ParallelGC

[Thomas Schatzl]

Hi,

On Fri, 2016-03-04 at 11:14 -0500, Tony Printezis wrote:
> Thomas,
> 
> I confirmed that the code below was incorrect and doing the addition
> before calling restore() fixes the issue. Latest webrev here:
> 
> http://cr.openjdk.java.net/~tonyp/8146991/webrev.2/
> 

  looks good to me. JPRT has been fine, although I messed up running
the other tests - I forgot to specify ParallelGC as collector to use.

I will redo that on Monday. I do not expect any issues.

Thanks,
  Thomas