* calls.c (special_function_p): New function broken out of
        expand_call.
        (precompute_register_parameters): Likewise.
        (store_one_arg): Likewise.
        (store_unaligned_argumetns_into_pseudos): Likewise.
        (save_fixed_argument_area): Likewise.
        (restore_fixed_argument_area): Likewise.
        (expand_call): Corresponding changes.

From-SVN: r24516