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	Fix a grevious dict-inlining infelicity
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This commit fixes an infelicity that must have been there
for a long time.  The problem was that dictionary functions
(arising from instance declarations) were treated as GlobalIds,
and hence no taken account of when doing free variable and dependency
analysis.    As a result, the specialiser was messing up dependency
order, so the program was considerably more complex than it should
be by the time it got to the strictness analyser.

Net result:
	PrelRead.$sreduce :: Integer -> Integer -> (Integer,Integer)
didn't get detected as strict.

Easily fixed, by making DictFunIds into LocalIds (albeit exported ones).