[m-rev.] Trivial diff: fix state variables bug

[Simon Taylor]

On 19-Feb-2003, Ralph Becket <rafe at cs.mu.OZ.AU> wrote:
> Estimated hours taken: 4
> Branches: main
> 
> compiler/make_hlds.m:
> 	Fixed a bug in the state variables transformation whereby
> 	if-then-else expressions were not being handled properly and
> 	causing information about state variables to be lost.

This should be committed on the release branch as well.
It also needs a regression test.

Simon.
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