RFR 8239893: Windows handle Leak when starting processes using ProcessBuilder

[Brian Burkhalter]

Hi Roger,

Looks good!

Brian

> On Mar 6, 2020, at 8:16 AM, Roger Riggs <Roger.Riggs at oracle.com> wrote:
> 
> Updated webrev:
>     http://cr.openjdk.java.net/~rriggs/webrev-handles-8239893-1/index.html <http://cr.openjdk.java.net/~rriggs/webrev-handles-8239893-1/index.html>
> 
> The threshold is a pretty loose target. 
> Given the original error that leaked a handle for every process started, it just needs to detect a growing number of handles in use.  But for the sake of accuracy and avoiding someone copying buggy code, its fixed.