[AArch64][PATCH 13/14] Support FP16 Adv.SIMD Shift By Immediate instructions.

[AArch64][PATCH 13/14] Support FP16 Adv.SIMD Shift By Immediate instructions.

ARMv8.2 adds 16-bit floating point operations as an optional extension
to the floating point and Adv.SIMD support. This patch extends
instructions in the group Adv.SIMD Shift By Immediate to support FP16,
making this support available when +simd+fp16 is enabled.

The new instructions legal make some uses of the 4h vector type that had
been invalid. This patch adjusts a test that checks for these uses.

The extended instructions are: SCVTF, FCVTZS, UCVTF and FCVTZU.

The general form for these instructions is
   <OP> <Vd>.<T>, <Vs>.<T>, #<imm>
   where T is 4h or 8h.

gas/testsuite/
2015-12-14  Matthew Wahab  <matthew.wahab@arm.com>

	* gas/aarch64/advsimd-fp16.d: Update expected output.
	* gas/aarch64/advsimd-fp16.s: Add tests for Adv.SIMD across lanes
	instructions.
	* gas/aarch64/illegal.d: Update expected output.
	* gas/aarch64/illegal.s: Replace tests for illegal use of 'h'
	specifier.

opcodes/
2015-12-14  Matthew Wahab  <matthew.wahab@arm.com>

	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Regenerate.
	* aarch64-opc-2.c: Regenerate.
	* aarch64-tbl.h (QL_VSHIFT_H): New.
	(aarch64_opcode_table): Add fp16 versions of scvtf, fcvtzs, ucvtf
	and fcvtzu to the Adv.SIMD shift by immediate group.

Change-Id: I3480f63883d54db46562573185da6982f2365ee8