removing some dead code. nw.
(nw) Temporarily split all RSP functions into SIMD and scalar versions so 
that they can more easily be run alongside each other for the purposes of 
regression testing. Currently SIMD ops introduce some lighting issues, but 
only when a light and model are axis-aligned, which makes it remarkably
difficult to track down based solely on comprehensive logging, so this will 
eventually allow for running the scalar version of the opcode after the SIMD 
one in order to deduce exactly which SIMD opcode is divergent.