RISC-V: Refactor RVV class by frm_op_type template arg

RISC-V: Refactor RVV class by frm_op_type template arg

As suggested by kito, we will add new frm_opt_type template arg
to the op class, to avoid the duplicated function expand.

Signed-off-by: Pan Li <pan2.li@intel.com>
gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins-bases.cc
	(class binop_frm): Removed.
	(class reverse_binop_frm): Ditto.
	(class widen_binop_frm): Ditto.
	(class vfmacc_frm): Ditto.
	(class vfnmacc_frm): Ditto.
	(class vfmsac_frm): Ditto.
	(class vfnmsac_frm): Ditto.
	(class vfmadd_frm): Ditto.
	(class vfnmadd_frm): Ditto.
	(class vfmsub_frm): Ditto.
	(class vfnmsub_frm): Ditto.
	(class vfwmacc_frm): Ditto.
	(class vfwnmacc_frm): Ditto.
	(class vfwmsac_frm): Ditto.
	(class vfwnmsac_frm): Ditto.
	(class unop_frm): Ditto.
	(class vfrec7_frm): Ditto.
	(class binop): Add frm_op_type template arg.
	(class unop): Ditto.
	(class widen_binop): Ditto.
	(class widen_binop_fp): Ditto.
	(class reverse_binop): Ditto.
	(class vfmacc): Ditto.
	(class vfnmsac): Ditto.
	(class vfmadd): Ditto.
	(class vfnmsub): Ditto.
	(class vfnmacc): Ditto.
	(class vfmsac): Ditto.
	(class vfnmadd): Ditto.
	(class vfmsub): Ditto.
	(class vfwmacc): Ditto.
	(class vfwnmacc): Ditto.
	(class vfwmsac): Ditto.
	(class vfwnmsac): Ditto.
	(class float_misc): Ditto.