Remove TypedArrayObject::isArrayIndex.  It's dead, Jim.  No bug, r=jimb (natch)

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extra : rebase_source : 11953fdb442ca989c8f5fd102f6f91124a75014c
Bug 471713 - Add a script to generate documentation for SpiderMonkey opcodes from an index comment in vm/Opcodes.h and eventual comments by each opcode.  (Actual opcode documentation to follow as reviews complete.)  Document only JSOP_NOP for now, and comment out the sys.exit() in error(), so that we get broken but readable skeleton documentation.  r=jwalden

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extra : rebase_source : 5d3c1feb8acbd24f661681fca6ecedacc7ce43a2