Port MachOp folding to new code generator.
* Rewrote cmmMachOpFold to cmmMachOpFoldM, which returns Nothing if no folding took place. * Wrote some generic mapping functions which take functions of form 'a -> Maybe a' and are smart about sharing. * Split up optimizations from PIC and PPC work in the native codegen, so they'll be easier to turn off later (they are not currently being turned off, however.) * Whitespace fixes! ToDo: Turn off MachOp folding when new codegenerator is being used. Signed-off-by: Edward Z. Yang <email@example.com>
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