registers are passed via macro args.
(CALL_NEXT): Define in terms of CALL_NEXT_PTR().
(rotate_regs): Fix it so it doesn't overwrite any local registers
once they are rotated. Note: it's OK to write the output
registers, since those are outside of the rotating partition.
(Logical change 1.184)
(save_static_to_stacked): Use LOAD_VAL.
(save_static_to_fr): Rename from save_static_to_fpreg().
(save_static_to_br): New function.
(save_static_to_mem): Likewise.
(Logical change 1.175)