* alpha-tdep.h (struct gdbarch_tdep): Add return_in_memory.

    * alpha-tdep.h (struct gdbarch_tdep): Add return_in_memory.
	* alpha-tdep.c (alpha_register_byte): Remove.
	(alpha_extract_struct_value_address): Remove.
	(alpha_return_value): New.
	(alpha_return_in_memory_always): New.
	(alpha_gdbarch_init): Set tdep->return_in_memory.  Don't call
	set_gdbarch_deprecated_register_byte.  Do call set_gdbarch_return_value
	instead of set_gdbarch_deprecated_use_struct_convention,
	set_gdbarch_extract_return_value, set_gdbarch_store_return_value,
	or set_gdbarch_deprecated_extract_struct_value_address.
	* alphafbsd-tdep.c (alphafbsd_return_in_memory): Rename from
	alphafbsd_use_struct_convention, remove gcc_p argument.
	(alphafbsd_init_abi): Set tdep->return_in_memory instead of
	set_gdbarch_deprecated_use_struct_convention.