[Support][BLAKE3] Prefix blake3_xof_many_avx512 (#148607)

This symbol was introduced in #147948, but not prefixed, resulting in
conflicts if libblake3 and LLVM are both linked statically into the same
binary.

Author: nikic

llvm/lib/Support/BLAKE3/llvm_blake3_prefix.h

@@ -34,6 +34,8 @@
 #define _blake3_compress_in_place_avx512 _llvm_blake3_compress_in_place_avx512
 #define blake3_compress_xof_avx512 llvm_blake3_compress_xof_avx512
 #define _blake3_compress_xof_avx512 _llvm_blake3_compress_xof_avx512
+#define blake3_xof_many_avx512 llvm_blake3_xof_many_avx512
+#define _blake3_xof_many_avx512 _llvm_blake3_xof_many_avx512
 #define blake3_hash_many_avx512 llvm_blake3_hash_many_avx512
 #define _blake3_hash_many_avx512 _llvm_blake3_hash_many_avx512
 #define blake3_hash_many_neon llvm_blake3_hash_many_neon