[m-rev.] diff: break up add_pragma and make_hlds_passes

[Zoltan Somogyi]

On Tue, 27 Jan 2015 12:17:07 +1100 (AEDT), Julien Fischer <jfischer at opturion.com> wrote:
> One of your recent changes to the handling of mutables has broken
> compilation of the standard library in the C# grade (and probably the
> other non-C grades):
> 
>     ...
>     Making Mercury/opts/pqueue.opt
>     Making Mercury/opts/pretty_printer.opt
>     pretty_printer.m:878: In predicate `set_io_pp_params'/3:
>     pretty_printer.m:878:   warning: unnecessary `promise_pure' pragma.
>     For more information, recompile with `-E'.
>     ** Error making `Mercury/opts/pretty_printer.opt'.

I will have a look. In the meantime, turning off halt-at-warn
should allow it to compile again.

By the way, has everyone installed the change to track format
strings through appends? I can't push the diff for enabling
warnings about unknown format strings until this has been done.

Zoltan.