[m-rev.] for review: Document where the target char value range is used.

[Julien Fischer]

Hi Peter,

On Wed, 25 Mar 2015, Peter Wang wrote:

> Document where the target char value range is used.
>
> Explicitly use the target's char value range in the appropriate places
> instead of the host's char value range.  The range of char values is the
> same for all existing targets, though, so this change mainly serves as
> documentation.
>
> compiler/string_encoding.m:
> 	Add `target_char_range' predicate.
>
> compiler/switch_util.m:
> compiler/type_util.m:
> 	Use the target char value range where appropriate.
>
> 	Delete XXXs.

That's fine.

Cheers,
Julien