s390: arch15: Vector eval

s390: arch15: Vector eval

Add instruction veval and builtin vec_evaluate.

gcc/ChangeLog:

	* config/s390/s390-builtins.def (s390_vec_evaluate): Add.
	(s390_veval): Add.
	* config/s390/s390-builtin-types.def: Update accordingly.
	* config/s390/s390.md (UNSPEC_VEC_VEVAL): Add.
	* config/s390/vecintrin.h (vec_evaluate): Define.
	* config/s390/vector.md
	(*veval<mode>_<logic_op1:logic_op_stringify><logic_op2:logic_op_stringify>):
	Add.
	(veval<mode>): Add.

gcc/testsuite/ChangeLog:

	* gcc.target/s390/vxe3/veval-1.c: New test.
	* gcc.target/s390/vxe3/veval-2.c: New test.
	* gcc.target/s390/vxe3/veval-3.c: New test.
	* gcc.target/s390/vxe3/veval-4.c: New test.
	* gcc.target/s390/vxe3/veval-5.c: New test.
	* gcc.target/s390/vxe3/veval-6.c: New test.
	* gcc.target/s390/vxe3/veval-7.c: New test.
	* gcc.target/s390/vxe3/veval-8.c: New test.
	* gcc.target/s390/vxe3/veval-9.c: New test.