[ast-optimizer-branch] simplification fixes for stage1 [patch]

[Diego Novillo]

On Thu, 2002-05-02 at 15:55, Daniel Berlin wrote:

> With these changes, the statement expression simplification works fine.
> 
Cool.  I'm glad to hear that.  It will be good to get rid of those
horrid statement expressions.

> So it must have been a bug in simplification elsewhere.
>
I suspect the same expression sharing problem that bit me yesterday.