* h8300-tdep.c: Add definitions E_RET0_REGNUM and E_RET1_REGNUM to

	* h8300-tdep.c: Add definitions E_RET0_REGNUM and E_RET1_REGNUM to
	indicate registers used for return values.
	(struct frame_extra_info): Drop args_pointer and locals_pointer.
	(h8300_examine_prologue): Remove initializing dropped frame_extra_info
	members.
	(h8300_init_extra_frame_info): Ditto.
	(h8300_frame_locals_address): Removed.
	(h8300_frame_args_address): Removed.
	(h8300_extract_return_value): Use new regcache structure. Only care
	for 16 bit CPUs.
	(h8300h_extract_return_value): Same function for 32 bit CPUs.
	(h8300_store_return_value): Use new regcache structure. Only care
	for 16 bit CPUs.
	(h8300h_store_return_value): Same function for 32 bit CPUs.
	(h8300_store_struct_return): Removed.
	(h8300_extract_struct_value_address): Use new regcache structure.
	(h8300h_extract_struct_value_address): Removed.
	(h8300_push_dummy_code): New function.
	(h8300_gdbarch_init): Slightly rearranged to stress deprecated calls.
	Remove call_dummy_words.  Call set_gdbarch_extract_return_value and
	set_gdbarch_store_return_value architecture dependent.
	Call set_gdbarch_push_dummy_code and
	set_gdbarch_extract_struct_value_address.
	Remove calls to set_gdbarch_frame_args_address,
	set_gdbarch_frame_locals_address,
	set_gdbarch_deprecated_store_struct_return,
	set_gdbarch_deprecated_extract_return_value,
	set_gdbarch_deprecated_extract_struct_value_address,
	set_gdbarch_deprecated_call_dummy_words and
	set_gdbarch_deprecated_sizeof_call_dummy_words.