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

[Daniel Berlin]

On Thu, 2 May 2002, Daniel Berlin wrote:

> Hah.
> 
> With these changes, the statement expression simplification works fine.
Wait, no, it doesn't.

I did it without -ftree-ssa.
Sorry for the optimisim.
We now return to your regularly scheduled "Why the heck is the compiler 
messing with me?"

> 
> So it must have been a bug in simplification elsewhere.
>