* config/s390/s390.c (struct machine_function): New member
last_restore_gpr.
(s390_frame_info): Add BASE_USED and RETURN_ADDR_USED parameters.
Do not modify machine->save_return_addr_p or regs_ever_live.
Fill in machine->last_restore_gpr.
(s390_optimize_prolog): Use s390_frame_info to compute registers
to save/restore, remove duplicated code.
(s390_arg_frame_offset): Use s390_frame_info to compute frame
size, remove duplicated code.
(s390_emit_prologue): Adapt s390_frame_info call. Update
machine->save_return_addr_p and regs_ever_live.
(s390_emit_epilogue): Use machine->last_restore_gpr instead of
machine->last_save_gpr.
From-SVN: r83275
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