If all address spaces use the same modes and forms, we would
be forced to replicate these hooks in the backend.  Which would
then require the creation of a new hook to replace
target_default_pointer_address_modes_p.

	* targhooks.c (default_addr_space_pointer_mode): Remove check
	for generic address space.
	(default_addr_space_address_mode): Likewise.
	(default_addr_space_valid_pointer_mode): Likewise.
	(default_addr_space_legitimate_address_p): Likewise.
	(default_addr_space_legitimize_address): Likewise.

From-SVN: r229143