CRIS epilogue as RTL.

	* config/cris/cris.md: Change all 0 in unspec 0 to
	CRIS_UNSPEC_PLT.
 	(CRIS_UNSPEC_PLT, CRIS_UNSPEC_FRAME_DEALLOC): New constants.
	("*cris_load_multiple", "cris_frame_deallocated_barrier"): New
	patterns.
	("return"): Change to define_expand.  Call cris_expand_return for
	actual expansion.
	("*return_expanded"): New pattern.
	("epilogue"): New define_expand.
	* config/cris/cris.h (PREDICATE_CODES): Add
	cris_load_multiple_op.
	* config/cris/cris.c (ASSERT_PLT_UNSPEC): Correct test for unspec
	type.
	(enum cris_retinsn_type): New.
	(struct machine_function): New member return_type.
	(TARGET_ASM_FUNCTION_EPILOGUE): Don't override.
	(cris_target_asm_function_epilogue): Remove, moving RTLified
	contents to...
	(cris_expand_epilogue): New function.
	(cris_reg_saved_in_regsave_area, cris_movem_load_rest_p,
	(cris_gen_movem_load, cris_load_multiple_op)
	(cris_return_address_on_stack_for_return, cris_expand_return): New
	functions.
	(cris_target_asm_function_prologue)
	(cris_initial_frame_pointer_offset): Call
	cris_reg_saved_in_regsave_area instead of complicated expression.
	Call cris_return_address_on_stack instead of an expression.
	(cris_print_operand) <case 'o', case 'O'>: New cases.
	(cris_return_address_on_stack): Change return-type to bool.
	(cris_simple_epilogue): Ditto.  Return false if registers are
	saved.
	* config/cris/cris-protos.h (cris_simple_epilogue)
	(cris_return_address_on_stack): Adjust prototype return type.
	(cris_gen_movem_load, cris_expand_epilogue, cris_expand_return)
	(cris_return_address_on_stack_for_return): New prototypes.

From-SVN: r97580