[RFA/ARM 17/21] Add support for 16-/64-bit Floating Point conversions.

[Matthew Gretton-Dann]

ARMv8 extends VCVT[TB] to support converting to/from double precision
floats.

This patch adds support for this, in the process it also fixes bugs in
the support for half-precision <-> single-precision conversions.

gas/ChangeLog:
2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

	* config/tc-arm.c (el_type_type_check): Add handling for 16-bit
	floating point types.
	(do_neon_cvttb_2): New function.
	(do_neon_cvttb_1): Likewise.
	(do_neon_cvtb): Refactor to use do_neon_cvttb_1.
	(do_neon_cvtt): Likewise.

gas/testsuite/ChangeLog:
2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

	* gas/arm/armv8-a+fp.d: Update testcase.
	* gas/arm/armv8-a+fp.s: Likewise.
	* gas/arm/half-prec-vfpv3.s: Likewise.

opcodes/ChangeLog:
2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

	* arm-dis.c (coprocessor_opcodes): Add support for HP/DP
	conversions.
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