[patch] Move the materalizer interface to Function

[Rafael Espíndola]

A rebased and slightly modified patch is attached. It keeps the
interface proper in GlobalValue as a convenience, but the first step
is a dyn_cast to Function which allows the actual materializer to be
implemented with Function arguments.

On 2 May 2014 00:39, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> The only thing we can materalize at the moment are functions. Move the
> interface there.
>
> The other thing there is some desire to be lazy about is metadata, and
> that is not a GlobalValue anyway.
>
> Cheers,
> Rafael
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