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

[Thomas Schatzl]

Hi,

On Mon, 2018-05-28 at 16:14 -0400, Kim Barrett 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/
> 

  looks good.

Thomas