RISC-V: Add Zvfbfmin and Zvfbfwma intrinsic

RISC-V: Add Zvfbfmin and Zvfbfwma intrinsic

v3: Modify warning message in riscv.cc
v2: Rebase
Accroding to the intrinsic doc, the 'Zvfbfmin' and 'Zvfbfwma' intrinsic
functions are added by this patch.

Signed-off-by: Feng Wang <wangfeng@eswincomputing.com>
gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins-bases.cc (class vfncvtbf16_f):
	Add 'Zvfbfmin' intrinsic in bases.
	(class vfwcvtbf16_f): Ditto.
	(class vfwmaccbf16): Add 'Zvfbfwma' intrinsic in bases.
	(BASE): Add BASE macro for 'Zvfbfmin' and 'Zvfbfwma'.
	* config/riscv/riscv-vector-builtins-bases.h: Add declaration for 'Zvfbfmin' and 'Zvfbfwma'.
	* config/riscv/riscv-vector-builtins-functions.def (REQUIRED_EXTENSIONS):
	Add builtins def for 'Zvfbfmin' and 'Zvfbfwma'.
	(vfncvtbf16_f): Ditto.
	(vfncvtbf16_f_frm): Ditto.
	(vfwcvtbf16_f): Ditto.
	(vfwmaccbf16): Ditto.
	(vfwmaccbf16_frm): Ditto.
	* config/riscv/riscv-vector-builtins-shapes.cc (supports_vectype_p):
	Add vector intrinsic build judgment for BFloat16.
	(build_all): Ditto.
	(BASE_NAME_MAX_LEN): Adjust max length.
	* config/riscv/riscv-vector-builtins-types.def (DEF_RVV_F32_OPS):
	Add new operand type for BFloat16.
	(vfloat32mf2_t): Ditto.
	(vfloat32m1_t): Ditto.
	(vfloat32m2_t): Ditto.
	(vfloat32m4_t): Ditto.
	(vfloat32m8_t): Ditto.
	* config/riscv/riscv-vector-builtins.cc (DEF_RVV_F32_OPS): Ditto.
	(validate_instance_type_required_extensions):
	Add required_ext checking for 'Zvfbfmin' and 'Zvfbfwma'.
	* config/riscv/riscv-vector-builtins.h (enum required_ext):
	Add required_ext declaration for 'Zvfbfmin' and 'Zvfbfwma'.
	(reqired_ext_to_isa_name): Ditto.
	(required_extensions_specified): Ditto.
	(struct function_group_info): Add match case for 'Zvfbfmin' and 'Zvfbfwma'.
	* config/riscv/riscv.cc (riscv_validate_vector_type):
	Add required_ext checking for 'Zvfbfmin' and 'Zvfbfwma'.