[m-dev.] for review: fix bug with quantification & instmap deltas

[Simon Taylor]

> Estimated hours taken: 1
> 
> Fix a bug that caused a variable not found error when compiling
> library/term_io.m with intermodule optimization in my local version
> of the Mercury compiler (which has various changes for existential types).
> The problem was that when liveness.m calls requantify_proc,
> quantification.m discovers that a variable is now local to a subgoal,
> but leaves the instmap delta on the containing goal unchanged, still
> containing a (now bogus) entry for that variable.
> I think the same problem could occur without my existenial types changes,

s/existenial/existential/

Otherwise this change is fine. The alias branch will need a different
fix because instmap_delta_restrict doesn't work with aliasing. It's probably 
necessary to run recompute_instmap_delta every time a goal is requantified
after mode analysis.

Simon.
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