RFR CSR JDK-8202555: Double.toString(double) sometimes produces incorrect results

[Brian Burkhalter]

> On Mar 17, 2020, at 2:13 PM, Brian Burkhalter <brian.burkhalter at oracle.com> wrote:
> 
>> The new code reflects this improvement and also adds a couple of additional tests.
>> 
>> Passes tier1 tests.
> 
> A tier 1-3 test run is in progress.

No failures related to this patch in the usual CI tiers 1-3 test run across the usual four platforms.

Brian