[m-dev.] for review: fix unsafe_type_cast for MLDS back-end

[Peter Ross]

On Wed, Dec 13, 2000 at 11:30:15PM +1100, Fergus Henderson wrote:
> Peter Ross, could you please review this one?
> 
> I think this change will cause bootstrapping problems if you try to
> bootstrap in grade hlc.gc, since it deletes the definition of
> unsafe_type_cast from runtime/mercury.h which older compilers rely on.
> But it should be fine if you bootstrap in grade asm_fast.gc or
> none.gc.
> 
My usual approach to avoid this problem is to add a #define at the top
of each source file.

This is done by the predicate `mlds_output_src_bootstrap_defines' in the
module `mlds_to_c.m'.

For example

#define MR_BOOTSTRAP_UNSAFE_TYPE_CAST

and then protect any code that you deleted or added with the appropiate
#define.  After a week or so, I then go through and remove the #define.

I would prefer if you implemented this approach, but on closer
inspection of the code I don't think it will be possible.  Oh well.

Otherwise the diff looks fine.

Pete
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