[PATCH] Fix PR 8639 (3.2.1 material)

[Joern Rennecke]

> +             /* If not multiplication, we can only do this if this is 
> +              * PLUS_EXPR and both operands are divisible by c. Note that
> +              * (80 - 4*x)/20 or (80 + (-4)*x)/20 must not degenerate
> +              * into (20 - x/5). */

I think you mean (4 - x/5).

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