[ARM] Add ARMv8.3 VJCVT instruction

[Szabolcs Nagy]

Add support for VJCVT javascript conversion instruction.

gas/
2016-12-05  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* config/tc-arm.c (arm_ext_v8_3, do_vjcvt): Define.
	(insns): Add vjcvt.

opcodes/
2016-12-05  Szabolcs Nagy  <szabolcs.nagy@arm.com>
	* arm-dis.c (coprocessor_opcodes): Add vjcvt.

gas/testsuite/
2016-12-05  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* gas/aarch64/armv8_3-a-fp.s: New.
	* gas/aarch64/armv8_3-a-fp.d: New.
	* gas/aarch64/armv8_3-a-fp-bad.s: New.
	* gas/aarch64/armv8_3-a-fp-bad.d: New.
	* gas/aarch64/armv8_3-a-fp-bad.l: New.
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