This is quite a big patch, as it reworks a large pass. The three backend passes dealing with sizes stuff have now been merged into one (because the traversal order is important).
Instead of generating sizes arrays by blindly appending "_sizes", we now create nonces and store them in the csArraySizes map in CompState, which is a bit less hacky.
Added to that, we also generate constant-size arrays (e.g. for [8]) -- which are needed in case we pass the array to a PROC that has a flexible dimension -- at the top of the whole program, and use that array for every variable with that size (so if foo and bar have the same size, we use the same sizes array from the top of the program).
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