[m-rev.] diff: fix solver type pruning bug

[Ralph Becket]

Fergus Henderson, Friday,  5 December 2003:
> Estimated hours taken: 1
> Branches: main
> 
> Fix a bug where we were incorrectly pruning nondet goals with a non-local
> variable of inst "any" whose type contained a solver type in one of
> its fields.
> 
> compiler/inst_match.m:
> 	Fix a bug: when memoizing the results of previous calls to
> 	inst_matches_*, include the maybe(type) argument in the key
> 	of the memo table, since that argument can effect the result.

s/effect/affect/
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