[m-rev.] for review: implement region cleanup at model_non if-then-elses

[Zoltan Somogyi]

On 28-Sep-2007, Zoltan Somogyi <zs at csse.unimelb.edu.au> wrote:
> This is for review by anyone, and for Quan to check whether the code
> it generates is the right code.

Quan need this and the diff has passed bootcheck, so I am committing this;
I will address any review comments (and a minor issue I discovered during
bootcheck) post commit.

Zoltan.
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