* config/s390/s390-protos.h (s390_function_prologue,
	s390_function_epilogue): Remove.
	config/s390/s390.c (s390_function_prologue, s390_function_epilogue,
	TARGET_ASM_FUNCTION_PROLOGUE, TARGET_ASM_FUNCTION_EPILOGUE): Remove.

	config/s390/s390.c (s390_machine_dependent_recorg): New function.
	config/s390/s390-protos.h (s390_machine_dependent_reorg): Declare it.
	config/s390/s390.h (MACHINE_DEPENDENT_REORG): Call it.
	config/s390/s390.c (s390_split_branches, s390_chunkify_pool): Adapt
	to being called from MACHINE_DEPENDENT_REORG.  Update regs_ever_live.

	config/s390/s390.c (s390_frame_info): Inline save_fprs_p.  Always
	assume BASE_REGISTER and RETURN_REGNUM need to be saved.
	(s390_emit_prologue): Assume RETURN_REGNUM to be saved iff
	function is not a leaf function.  Use save_gprs and restore_gprs.
	(s390_emit_epilogue): Likewise.
	(save_gprs, restore_gprs): New functions.
	(struct s390_frame): Remove return_reg_saved_p member.
	(save_fprs_p): Remove.
	(s390_optimize_prolog): New function.
	(s390_legitimate_reload_constant): Remove now unnecessary check.

	(s390_function_count): Remove.
	(s390_output_symbolic_const): Replace s390_function_count by
	current_function_funcdef_no.
	(s390_output_constant_pool): Likewise.

	(legitimize_pic_address): Use regs_ever_live to track PIC register
	instead of current_function_uses_pic_offset_table.
	(s390_emit_prologue): Likewise.
	config/s390/s390.md ("call", "call_value"): Likewise.

From-SVN: r56584