Add support for parsing VFP register names in .cfi_offset directives.

	PR gas/16694
	* config/tc-arm.c (tc_arm_regname_to_dw2regnum): Parse VFP
	registers as well.

	* gas/cfi/cfi-arm-1.s: Add checks of VFP registers.
	* gas/cfi/cfi-arm-1.d: Update expected output.