8240754: Instrument FlowTest.java to provide more debug traces.

[Chris Hegarty]

Daniel,

> On 9 Mar 2020, at 16:53, Daniel Fuchs <daniel.fuchs at oracle.com> wrote:
> 
> Hi,
> 
> Please find below a changeset that adds some more debugging
> output to FlowTest.java for better test failure diagnosis.
> 
> 8240754: Instrument FlowTest.java to provide more debug traces.
> https://bugs.openjdk.java.net/browse/JDK-8240754
> 
> webrev:
> http://cr.openjdk.java.net/~dfuchs/webrev_8240754/webrev.00/

Looks ok to me.

-Chris.