[m-rev.] for review: enumeration argument packing

[Julien Fischer]

Hi Peter,

In case someone reviews this before this evening, could you please
hold off committing this until after I create the 11.07 branch.

Julien.

On Mon, 27 Jun 2011, Peter Wang wrote:

> For review by anyone.
>
> Branches: main
>
> Pack consecutive enumeration arguments in discriminated union types into a
> single word to reduce cell sizes.  Argument packing is only enabled on C
> back-ends, and reordering arguments to improve opportunities for packing is
> not yet attempted.  The RTTI implementations for other back-ends will need to
> be updated, but that is best left until after any argument reordering change.
>
> Modules which import abstract enumeration types are notified so by writing
> declarations of the form:
>
> 	:- type foo where type_is_abstract_enum(NumBits).
>
> into the interface file for the module which defines the type.
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