[AArch64][llvm] Add intrinsics for SVE BFSCALE (#172025) Add AArch64 intrinsics for BFloat16 floating-point adjust exponent vectors: ```c svbfloat16_t svscale[_bf16]_m (svbool_t pg, svbfloat16_t zdn, svint16_t zm); svbfloat16_t svscale[_bf16]_x (svbool_t pg, svbfloat16_t zdn, svint16_t zm); svbfloat16_t svscale[_bf16]_z (svbool_t pg, svbfloat16_t zdn, svint16_t zm); svbfloat16_t svscale[_n_bf16]_m (svbool_t pg, svbfloat16_t zdn, int16_t zm); svbfloat16_t svscale[_n_bf16]_x (svbool_t pg, svbfloat16_t zdn, int16_t zm); svbfloat16_t svscale[_n_bf16]_z (svbool_t pg, svbfloat16_t zdn, int16_t zm); ```
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