JuliaFolds / Transducers.jl / 2009

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Specialize foldl for cartesian style arrays (#407)

This patch implements a specialization of `foldl` on arrays with
`IndexCartesian` index style.  This gives us more than 2x speedup (see
`sum_transpose` benchmark).

The implementation mostly just redirects the call to `foldl` of
`CartesianIndices`.  Most of the code is for compatibility with Julia
< 1.5.  This PR also fixes a bug in `foldl` for multi-dimensional
`Broadcasted` (probably introduced by #403).

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