genattrtab.c (copy_rtx_unchanging): Remove #if 0'ed code.

        * genattrtab.c (copy_rtx_unchanging): Remove #if 0'ed code.
        Remove #if 0'ed function simplify_by_alternatives.
        (optimize_attrs): Remove #if 0'ed code.
        Remove ^L.
        Use ISO C90 prototypes.
        (make_canonical): Remove #if 0'ed code.
        (convert_const_symbol_ref): Remove #if 0'ed function.

From-SVN: r67298