RandomX: added SSE4.1-optimized Blake2b

+0.15% on `rx/0`
+0.3% on `rx/wow`

src/crypto/rx/RxVm.cpp

@@ -31,6 +31,11 @@
 #include "crypto/rx/RxVm.h"
 
 
+#if defined(_M_X64) || defined(__x86_64__)
+extern "C" uint32_t rx_blake2b_use_sse41;
+#endif
+
+
 randomx_vm* xmrig::RxVm::create(RxDataset *dataset, uint8_t *scratchpad, bool softAes, xmrig::Assembly assembly, uint32_t node)
 {
     int flags = 0;
@@ -55,6 +60,10 @@ randomx_vm* xmrig::RxVm::create(RxDataset *dataset, uint8_t *scratchpad, bool so
         flags |= RANDOMX_FLAG_AMD;
     }
 
+#   if defined(_M_X64) || defined(__x86_64__)
+    rx_blake2b_use_sse41 = Cpu::info()->has(ICpuInfo::FLAG_SSE41) ? 1 : 0;
+#   endif
+
     return randomx_create_vm(static_cast<randomx_flags>(flags), dataset->cache() ? dataset->cache()->get() : nullptr, dataset->get(), scratchpad, node);
 }