[m-dev.] for review: eliminate cast_to_unsigned

[Fergus Henderson]

On 20-Jan-2001, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> Delete the `cast_to_unsigned' unary operator from builtin_ops, and
> replace it with an `unsigned_le' binary operator for doing unsigned
> less-then-or-equal comparisons.

That passed bootcheck with both `--grade hlc.gc' and
`--grade asm_fast.gc -O4'.  I'll go ahead and commit it.
Review comments still welcome, of course.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
                                    |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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