fix indexin for new Dict syntax

The new Dict syntax broke `indexin`. I think this fix is ok? Should there be a test for this?
Yes indeed. I wanted to make it look more fancy then it is :D. Thanks for merging.

On 08 Oct 2014, at 23:56, Jeff Bezanson <notifications@github.com> wrote:

> In test/arrayops.jl:
> 
> > @@ -902,3 +902,11 @@ function i7197()
> >      ind2sub(size(S), 5)
> >  end
> >  @test i7197() == (2,2)
> > +
> > +# PR #8622 and general indexin test
> > +function pr8622()
> > +    x=[1,3,5,7]
> > +    y=[5,4,3]
> > +    return indexin(x,y)
> Doesn't matter, but this could easily be a one-liner.
> 
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