RFR: 8203843: BasicParState::default_estimated_thread_count(false) can return 0 in gtest

[Kim Barrett]

> On May 28, 2018, at 4:23 PM, Thomas Stüfe <thomas.stuefe at gmail.com> wrote:
> 
> Looks fine.
> 
> ..Thomas 
> 
> On Mon 28. May 2018 at 22:14, Kim Barrett <kim.barrett at oracle.com> wrote:
> Please review this small change to default_estimated_thread_count to
> always return a value of at least 1.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8203843
> 
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8203843/open.00/

Thanks.