Fix array support (-Oarray optimization)#143
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This change makes it easier to figure out the type of array literals which is required for the array wrapping transformation xform_array.
This transformation wraps arrays in records. The purpose of this is to simplify C code generation which was incorrectly generating 'x = y;' to copy an array.
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This transformation fixes array support by wrapping arrays in structs.
This works because C does not support array assignment (because arrays are promoted to pointers) but it does support struct assignment.
Fixes #41