* config/tc-arm.c (arm_it): Add immisfloat field.

	* config/tc-arm.c (arm_it): Add immisfloat field.
	(parse_qfloat_immediate): Disallow integer syntax for floating-point
	immediates. Fix hex immediates, handle 0.0 and -0.0 specially.
	(parse_neon_mov): Set immisfloat bit for operand if it parsed as a
	float.
	(neon_cmode_for_move_imm): Reject non-float immediates for float
	operands.
	(neon_move_immediate): Pass immisfloat bit to neon_cmode_for_move_imm.