* mips-tdep.c (mips16_decode_reg_save): Delete, no longer used.

    * mips-tdep.c (mips16_decode_reg_save): Delete, no longer used.
        (mips_insn16_frame_cache): Pass frame cache in call to
        heuristic_proc_desc. Move some code to mips16_heuristic_proc_desc.
        Remove code that became redundant as a consequence.
        (mips32_heuristic_proc_desc): No longer compute a fake
        procedure descriptor. Compute the full frame cache instead.
        Some minor comment reformatting.