stormy16.c: Use REG_P, MEM_P and CONST_INT_P where appropriate.

stormy16.c: Use REG_P, MEM_P and CONST_INT_P where appropriate.

        * config/stormy16/stormy16.c: Use REG_P, MEM_P and CONST_INT_P
        where appropriate.
        (xstormy16_legitimate_address_p): Use true and false instead of 1
        and 0.
        (xstormy16_expand_prologue): Delete unused local variable 'insn'.
        (xstormy16_function_arg): Use FIRST_ARGUMENT_REGNUM in place of
        magic constant 2.
        (xstormy16_expand_call): Fix comment at start of function.

From-SVN: r163722