feat: add RVV fast Hadamard transform operators#613
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Co-authored-by: lyd1992 <liuyudong@iscas.ac.cn> Co-authored-by: YuanSheng <yuansheng@isrc.iscas.ac.cn>
fht_rvv.cc is globbed into the build on every platform, but unlike the other ISA files it had no arch guard and never included <riscv_vector.h>. clang-tidy (run on x86) and non-RISC-V builds therefore failed on undeclared RVV intrinsics/types. Wrap the body in #if defined(__riscv_vector) and move the intrinsics header inside the guard, mirroring fht_neon.cc. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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