S/390: Remove vx2 facility flag

S/390: Remove vx2 facility flag

This patch removes the vx2 facility flag.  It will not be used by GCC
and was a misnomer anyway.

Committed to mainline and 2.28 branch.

include/ChangeLog:

2017-03-21  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* opcode/s390.h (S390_INSTR_FLAG_VX2): Remove.
	(S390_INSTR_FLAG_FACILITY_MASK): Adjust value.

gas/ChangeLog:

2017-03-21  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config/tc-s390.c (s390_parse_cpu): Remove S390_INSTR_FLAG_VX2
	from cpu_table.  Remove vx2, and novx2 from cpu_flags.

opcodes/ChangeLog:

2017-03-21  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* s390-mkopc.c (main): Remove vx2 check.
	* s390-opc.txt: Remove vx2 instruction flags.