Yes, the references to the Necromancer in the first, seventh, and penultimate chapters all go back to the original manuscript, and at one point it's made explicit that this is the same Necromancer who was defeated by Beren & Luthien.
Hope this helps.
>From: William Cloud Hicklin <solicitr@...>
>Sent: Mar 5, 2007 9:52 AM
>Subject: [mythsoc] For Mr Rateliff on Mr Baggins
>The Necromancer is named twice in The Hobbit: once
>towards the end, and thus written close in time at
>least to The Fall of Numenor; and once in the
>first chapter. Was this mention present in the
>"1932" version, the typescript read by Lewis, or
>did Tolkien add it when preparing the book for