This is a tidy-up check in which creates an enum neon_cvt_flavour, and
moves all the data which depends on it into one large 'table'.  This was
done to make the code understandable for adding the new VCVT variants.

gas/ChangeLog:

2012-08-23  Matthew Gretton-Dann  <matthew.gretton-dann@arm>

	* config/tc-arm.c (CVT_FLAVOUR_VAR): New define.
	(CVT_VAR): New helper define.
	(neon_cvt_flavour): New enumeration, function renamed...
	(get_neon_cvt_flavour): ...to this.
	(do_vfp_nsyn_cvt): Update to use new neon_cvt_flavour.
	(do_vfp_nsyn_cvtz): Likewise.
	(do_neon_cvt_1): Likewise.