Combine common code / reduce codegen by factoring out common parts#819
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Split these shape check functions into parts that don't require using the element type as a generic parameter. This means that less instantiations of this code is needed for a typical user of ndarray.
Remove redundant .clone() and simplify inner loop
The original design was that the apply cores were "resumable", and thus we'd put the dimension "back in order" when exiting the method. However, this is not in use today (and loop break from FoldWhile also bypasses this tail code, anyway), so just remove this unused line.
The innermost loop is the stretch of constant stride (for the contiguous case, this is the whole loop); with a lot of function arguments, this part is actually commmon to the three loops (contig, c, and f). Also make a small simplification of this inner loop; use a while loop to have less code to compile in this much instantiated function.
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The goal is to reduce the amount of code (as counted by cargo-llvm-lines) generated for our functions.