RISC-V: Add floating-point RVV C/C++ api

RISC-V: Add floating-point RVV C/C++ api

Add RVV floating-point C/C++ api tests.
The api unit-tests are all passed but not commit.
They are located at RISC-V foundation repo:
https://github.com/riscv-collab/riscv-gcc/tree/rvv-submission-v1

gcc/ChangeLog:

	* config/riscv/iterators.md: New iterator.
	* config/riscv/riscv-vector-builtins-bases.cc (class widen_binop): New class.
	(enum ternop_type): New enum.
	(class vmacc): New class.
	(class imac): Ditto.
	(class vnmsac): Ditto.
	(enum widen_ternop_type): New enum.
	(class vmadd): Ditto.
	(class vnmsub): Ditto.
	(class iwmac): Ditto.
	(class vwmacc): Ditto.
	(class vwmaccu): Ditto.
	(class vwmaccsu): Ditto.
	(class vwmaccus): 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.
	(class fcmp): Ditto.
	(class vfclass): Ditto.
	(class vfcvt_x): Ditto.
	(class vfcvt_rtz_x): Ditto.
	(class vfcvt_f): Ditto.
	(class vfwcvt_x): Ditto.
	(class vfwcvt_rtz_x): Ditto.
	(class vfwcvt_f): Ditto.
	(class vfncvt_x): Ditto.
	(class vfncvt_rtz_x): Ditto.
	(class vfncvt_f): Ditto.
	(class vfncvt_rod_f): Ditto.
	(BASE): Ditto.
	* config/riscv/riscv-vector-builtins-bases.h:
	* config/riscv/riscv-vector-builtins-functions.def (vzext): Ditto.
	(vsext): Ditto.
	(vfadd): Ditto.
	(vfsub): Ditto.
	(vfrsub): Ditto.
	(vfwadd): Ditto.
	(vfwsub): Ditto.
	(vfmul): Ditto.
	(vfdiv): Ditto.
	(vfrdiv): Ditto.
	(vfwmul): Ditto.
	(vfmacc): Ditto.
	(vfnmsac): Ditto.
	(vfmadd): Ditto.
	(vfnmsub): Ditto.
	(vfnmacc): Ditto.
	(vfmsac): Ditto.
	(vfnmadd): Ditto.
	(vfmsub): Ditto.
	(vfwmacc): Ditto.
	(vfwnmacc): Ditto.
	(vfwmsac): Ditto.
	(vfwnmsac): Ditto.
	(vfsqrt): Ditto.
	(vfrsqrt7): Ditto.
	(vfrec7): Ditto.
	(vfmin): Ditto.
	(vfmax): Ditto.
	(vfsgnj): Ditto.
	(vfsgnjn): Ditto.
	(vfsgnjx): Ditto.
	(vfneg): Ditto.
	(vfabs): Ditto.
	(vmfeq): Ditto.
	(vmfne): Ditto.
	(vmflt): Ditto.
	(vmfle): Ditto.
	(vmfgt): Ditto.
	(vmfge): Ditto.
	(vfclass): Ditto.
	(vfmerge): Ditto.
	(vfmv_v): Ditto.
	(vfcvt_x): Ditto.
	(vfcvt_xu): Ditto.
	(vfcvt_rtz_x): Ditto.
	(vfcvt_rtz_xu): Ditto.
	(vfcvt_f): Ditto.
	(vfwcvt_x): Ditto.
	(vfwcvt_xu): Ditto.
	(vfwcvt_rtz_x): Ditto.
	(vfwcvt_rtz_xu): Ditto.
	(vfwcvt_f): Ditto.
	(vfncvt_x): Ditto.
	(vfncvt_xu): Ditto.
	(vfncvt_rtz_x): Ditto.
	(vfncvt_rtz_xu): Ditto.
	(vfncvt_f): Ditto.
	(vfncvt_rod_f): Ditto.
	* config/riscv/riscv-vector-builtins-shapes.cc (struct alu_def): Ditto.
	(struct move_def): Ditto.
	* config/riscv/riscv-vector-builtins-types.def (DEF_RVV_WEXTF_OPS): New macro.
	(DEF_RVV_CONVERT_I_OPS): Ditto.
	(DEF_RVV_CONVERT_U_OPS): Ditto.
	(DEF_RVV_WCONVERT_I_OPS): Ditto.
	(DEF_RVV_WCONVERT_U_OPS): Ditto.
	(DEF_RVV_WCONVERT_F_OPS): Ditto.
	(vfloat64m1_t): Ditto.
	(vfloat64m2_t): Ditto.
	(vfloat64m4_t): Ditto.
	(vfloat64m8_t): Ditto.
	(vint32mf2_t): Ditto.
	(vint32m1_t): Ditto.
	(vint32m2_t): Ditto.
	(vint32m4_t): Ditto.
	(vint32m8_t): Ditto.
	(vint64m1_t): Ditto.
	(vint64m2_t): Ditto.
	(vint64m4_t): Ditto.
	(vint64m8_t): Ditto.
	(vuint32mf2_t): Ditto.
	(vuint32m1_t): Ditto.
	(vuint32m2_t): Ditto.
	(vuint32m4_t): Ditto.
	(vuint32m8_t): Ditto.
	(vuint64m1_t): Ditto.
	(vuint64m2_t): Ditto.
	(vuint64m4_t): Ditto.
	(vuint64m8_t): Ditto.
	* config/riscv/riscv-vector-builtins.cc (DEF_RVV_CONVERT_I_OPS): Ditto.
	(DEF_RVV_CONVERT_U_OPS): Ditto.
	(DEF_RVV_WCONVERT_I_OPS): Ditto.
	(DEF_RVV_WCONVERT_U_OPS): Ditto.
	(DEF_RVV_WCONVERT_F_OPS): Ditto.
	(DEF_RVV_F_OPS): Ditto.
	(DEF_RVV_WEXTF_OPS): Ditto.
	(required_extensions_p): Adjust for floating-point support.
	(check_required_extensions): Ditto.
	(unsigned_base_type_p): Ditto.
	(get_mode_for_bitsize): Ditto.
	(rvv_arg_type_info::get_base_vector_type): Ditto.
	(rvv_arg_type_info::get_tree_type): Ditto.
	* config/riscv/riscv-vector-builtins.def (v_f): New define.
	(f): New define.
	(f_v): New define.
	(xu_v): New define.
	(f_w): New define.
	(xu_w): New define.
	* config/riscv/riscv-vector-builtins.h (enum rvv_base_type): New enum.
	(function_expander::arg_mode): New function.
	* config/riscv/vector-iterators.md (sof): New iterator.
	(vfrecp): Ditto.
	(copysign): Ditto.
	(n): Ditto.
	(msac): Ditto.
	(msub): Ditto.
	(fixuns_trunc): Ditto.
	(floatuns): Ditto.
	* config/riscv/vector.md (@pred_broadcast<mode>): New pattern.
	(@pred_<optab><mode>): Ditto.
	(@pred_<optab><mode>_scalar): Ditto.
	(@pred_<optab><mode>_reverse_scalar): Ditto.
	(@pred_<copysign><mode>): Ditto.
	(@pred_<copysign><mode>_scalar): Ditto.
	(@pred_mul_<optab><mode>): Ditto.
	(pred_mul_<optab><mode>_undef_merge): Ditto.
	(*pred_<madd_nmsub><mode>): Ditto.
	(*pred_<macc_nmsac><mode>): Ditto.
	(*pred_mul_<optab><mode>): Ditto.
	(@pred_mul_<optab><mode>_scalar): Ditto.
	(*pred_mul_<optab><mode>_undef_merge_scalar): Ditto.
	(*pred_<madd_nmsub><mode>_scalar): Ditto.
	(*pred_<macc_nmsac><mode>_scalar): Ditto.
	(*pred_mul_<optab><mode>_scalar): Ditto.
	(@pred_neg_mul_<optab><mode>): Ditto.
	(pred_neg_mul_<optab><mode>_undef_merge): Ditto.
	(*pred_<nmadd_msub><mode>): Ditto.
	(*pred_<nmacc_msac><mode>): Ditto.
	(*pred_neg_mul_<optab><mode>): Ditto.
	(@pred_neg_mul_<optab><mode>_scalar): Ditto.
	(*pred_neg_mul_<optab><mode>_undef_merge_scalar): Ditto.
	(*pred_<nmadd_msub><mode>_scalar): Ditto.
	(*pred_<nmacc_msac><mode>_scalar): Ditto.
	(*pred_neg_mul_<optab><mode>_scalar): Ditto.
	(@pred_<misc_op><mode>): Ditto.
	(@pred_class<mode>): Ditto.
	(@pred_dual_widen_<optab><mode>): Ditto.
	(@pred_dual_widen_<optab><mode>_scalar): Ditto.
	(@pred_single_widen_<plus_minus:optab><mode>): Ditto.
	(@pred_single_widen_<plus_minus:optab><mode>_scalar): Ditto.
	(@pred_widen_mul_<optab><mode>): Ditto.
	(@pred_widen_mul_<optab><mode>_scalar): Ditto.
	(@pred_widen_neg_mul_<optab><mode>): Ditto.
	(@pred_widen_neg_mul_<optab><mode>_scalar): Ditto.
	(@pred_cmp<mode>): Ditto.
	(*pred_cmp<mode>): Ditto.
	(*pred_cmp<mode>_narrow): Ditto.
	(@pred_cmp<mode>_scalar): Ditto.
	(*pred_cmp<mode>_scalar): Ditto.
	(*pred_cmp<mode>_scalar_narrow): Ditto.
	(@pred_eqne<mode>_scalar): Ditto.
	(*pred_eqne<mode>_scalar): Ditto.
	(*pred_eqne<mode>_scalar_narrow): Ditto.
	(@pred_merge<mode>_scalar): Ditto.
	(@pred_fcvt_x<v_su>_f<mode>): Ditto.
	(@pred_<fix_cvt><mode>): Ditto.
	(@pred_<float_cvt><mode>): Ditto.
	(@pred_widen_fcvt_x<v_su>_f<mode>): Ditto.
	(@pred_widen_<fix_cvt><mode>): Ditto.
	(@pred_widen_<float_cvt><mode>): Ditto.
	(@pred_extend<mode>): Ditto.
	(@pred_narrow_fcvt_x<v_su>_f<mode>): Ditto.
	(@pred_narrow_<fix_cvt><mode>): Ditto.
	(@pred_narrow_<float_cvt><mode>): Ditto.
	(@pred_trunc<mode>): Ditto.
	(@pred_rod_trunc<mode>): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/ternop_vv_constraint-3.c: New test.
	* gcc.target/riscv/rvv/base/ternop_vv_constraint-4.c: New test.
	* gcc.target/riscv/rvv/base/ternop_vv_constraint-5.c: New test.
	* gcc.target/riscv/rvv/base/ternop_vv_constraint-6.c: New test.
	* gcc.target/riscv/rvv/base/ternop_vx_constraint-8.c: New test.
	* gcc.target/riscv/rvv/base/ternop_vx_constraint-9.c: New test.