[m-rev.] diff: fix a bug in loop invariant hoisting

[Zoltan Somogyi]

On 20-Sep-2004, Julien Fischer <juliensf at cs.mu.OZ.AU> wrote:
> The bug was caused by the modes of the extra arguments in
> foreign procs not being considered.  The current fix
> is to just make any extra arguments non-hoistable.

That looks fine, but it begs the question of what loop invariant optimization
was doing with such goals in the first place. IIRC, all foreign_procs with
extra arguments are marked as impure or semipure, and so shouldn't be optimized
away by loop invariant optimization.

Zoltan.
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