[foreign] RFR 8210911 jextract does not handle redundant forward, backward declarations of struct, union, enum properly

[Henry Jen]

Change looks reasonable to me.

Cheers,
Henry


> On Sep 19, 2018, at 7:13 AM, Sundararajan Athijegannathan <sundararajan.athijegannathan at oracle.com> wrote:
> 
> Please review.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8210911
> Webrev: http://cr.openjdk.java.net/~sundar/8210911/webrev.00/
> 
> PS. Piggybacking to add a TreePhase interface for visitors.
> 
> Thanks
> -Sundar