[m-rev.] for review: pack sub-word-sized integers and dummies

[Zoltan Somogyi]

On Sun, 6 May 2018 00:25:23 -0400 (EDT), Julien Fischer <jfischer at opturion.com> wrote:
> Building the library in the C# grade now breaks:
> 
>     Making Mercury/opts/thread.semaphore.opt
>     Making Mercury/css/array.cs
>     Uncaught Mercury exception:
>     Software Error: predicate `ml_backend.ml_unify_gen.ml_gen_cons_args'/12: Unexpected: full
>     Stack dump not available in this grade.
>     ** Error making `Mercury/css/array.cs'.

The attached diff fixes this abort and lets a C# bootcheck go
as far as building all the .cs files in the stage 2 library, which is
as far as it can go on my machine, which has no C# compiler
installed. Bootchecks in hlc.gc and asm_fast.gc succeeded.

I am committing diff. I dont think a review would be all that useful,
but trying it out in C# and Java grades would be. Please tell me
whether it works or not. However, I am leaving on a four-day trip
tomorrow afternoon European time, and probably won't have internet
access through most of it, so if a problem is reported after about
12 hours after this email is sent, I won't be able to attend to it.

Zoltan.
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