RFR 8190974 Parallel stream execution within a custom ForkJoinPool should obey the parallelism

[Paul Sandoz]

> On 8 Nov 2017, at 18:44, Martin Buchholz <martinrb at google.com> wrote:
> 
> Looks good, but have comments as always.
> 
> Fix type: exection
> 
> Unrelated typo: the this slice spliterator
> 

Fixed.

Thanks,
Paul.

> I would test core libraries under taskset with an odd number of cpus
>