s390: Update vec_(load,store)_len(,_r)

s390: Update vec_(load,store)_len(,_r)

Reflect latest updates for vec_(load,store)_len(,_r) which means that
all types except character based types are deprecated.

gcc/ChangeLog:

	* config/s390/s390-builtins.def (s390_vec_load_len): Deprecate
	some overloads.
	(s390_vec_store_len): Deprecate some overloads.
	(s390_vec_load_len_r): Add.
	(s390_vec_store_len_r): Add.
	* config/s390/s390-c.cc (s390_vec_load_len_r): Add.
	(s390_vec_store_len_r): Add.
	* config/s390/vecintrin.h (vec_load_len_r): Redefine.
	(vec_store_len_r): Redefine.