Bug 963634 - Remove jsopcode.tbl and jsoplengen.cpp in favor of a higher-order macro, and make JSOP_*_LENGTH into C++ constant variables.  This will make the build process simpler, and it likely eliminates a needs-CLOBBER situation encountered while landing bug 948583.  Particular thanks to r=jorendorff for the fast review here (given any change at all to jsopcode.tbl would bitrot this)

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extra : rebase_source : 4f5956dd196ff894766210cc4c9629054fc2914d