[whatwg/encoding] Editorial optimization: Move EUDC before index lookup (#52)

It looks like there are no jis0208 index entries in the EUDC pointer range. It is, therefore, useless to search the index before doing the EUDC check. Please move the EUDC check before the index search in the Shift_JIS decoder and maybe add some assertion into the index generation scripts to make sure the EUDC range stays unmapped in the index.

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