Due to inlining, we can now see unexported functions and variables,
    and functions and variables imported from different packages.
    Ignore them rather than reporting them from this package.
    
    Handle $hash and $equal functions consistently, so that we discard the
    inline body if there is one.
    
    Ignore names created for result parameters for inlining purposes.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/180758

From-SVN: r272023