Make zip(:with) use R:I.ZipIterablesMapIterator
Make zip(:with) use R:I.ZipIterablesMapIterator

- makes zip(@a,@b,:with(&[+|~]) about 12x faster
- makes zip(@a,@b,:with(&op)) about 7x faster

Sadly, this does not affect Zop yet, as that codegens directly to
a METAOP_ZIP call currently.

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