PR82317: S/390: Fix vec_min/vec_max builtins for IBM z13.

PR82317: S/390: Fix vec_min/vec_max builtins for IBM z13.

With IBM z14 a hardware instruction for floating point min and max has
been added while for IBM z13 we emulated min/max for vector double with
compare and select.  This testcase makes sure that we fall back to the
emulated variant when compiling for z13.

gcc/ChangeLog:

2017-10-06  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	PR target/82317
	* config/s390/s390-builtin-types.def: Regenerate.
	* config/s390/s390-builtins.def (s390_vfmaxdb_4, s390_vfmindb_4):
	Change flag from B_VXE to B_VX.
	(s390_vec_min_dbl): Remove B_VXE flag.

gcc/testsuite/ChangeLog:

2017-10-06  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	PR target/82317
	* gcc.target/s390/zvector/pr82317.c: New test.

From-SVN: r253480