[m-rev.] for review: bulk unify and compare

[Zoltan Somogyi]

On Wed, 3 Oct 2018 14:06:00 +0000 (UTC), Julien Fischer <jfischer at opturion.com> wrote:
> It has however broken the Erlang grade:
> 
> 
>     ...
>     Making Mercury/ints/thread.mvar.int
>     Making Mercury/ints/thread.semaphore.int
>     Making Mercury/opts/array.opt
>     Uncaught Mercury exception:
>     Software Error: function
>     `check_hlds.unify_proc.compute_maybe_packable_args_locn'/1: Unexpected:
>     wrong tag for a general du functor with args
>     Stack dump not available in this grade.
>     ** Error making `Mercury/opts/array.opt'.

I just committed a diff to fix the sanity check that led to the above.

Zoltan.