[m-rev.] diff: [CTGC] improve type_contains_subtype

[Julien Fischer]

On Mon, 28 Jul 2008, Peter Wang wrote:

> Branches: main
>
> compiler/ctgc.selector.m:
> 	Change `type_contains_subtype' to perform a breadth-first search
> 	instead of a depth-first search, keeping better track of the types
> 	that already seen.  This avoids some really bad performance when
> 	performing structure sharing analysis on some modules.

It would be helpful if the above were included as a comment above the
relevant section of code.

Julien.
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