[m-dev.] diff: bug fix

[Fergus Henderson]

Simon TAYLOR, you wrote:
> 
> Could you please review this.
...
> Fix a determinism analysis abort ("inappropriate determinism inside a 
> negation") which was caused by det_analysis.m not updating the instmap 
> to include the initial insts of the lambda variables before processing 
> a lambda goal. This problem was also present in cse_detection.m and 
> simplify.m.

That one looks fine.  Please commit it.

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