RFR: JDK-8219147 javadoc should expose covariant return type overrides

[Hannes Wallnöfer]

Looks good to me.

Hannes


> Am 22.05.2019 um 02:34 schrieb Jonathan Gibbons <jonathan.gibbons at oracle.com>:
> 
> Please review a small change to the VisibleMemberTable, such that javadoc will treat methods with a covariant return type as a non-trivial override.  This means that such methods will show up explicitly in the main summary table for a type, and not be relegated to the "Methods declared in" section of the summary table.
> 
> -- Jon
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8219147
> Webrev: http://cr.openjdk.java.net/~jjg/8219147-covariant-overrides/webrev.00/
> 
> 
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