Optimize implementation of zipWith and map #32
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This removes traversal of Fun and reduces amount of work optimizer need to do slightly (~10% allocation reduction)
It reduces amount of work for GHC a bit. Note that zipWith is very common and izipWith is rare. So extra code is justified in this case
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At the moment they are implemented in terms of zipWith and imap. This creates extra work for optimizer which has to strip unused parameters at each call site.
Also add another unrelated compile time optimization to zipWith