RandomX: optimized soft AES code

Unrolled loop was 5-10% slower depending on CPU.

src/crypto/randomx/aes_hash.cpp

@@ -270,19 +270,22 @@ void hashAndFillAes1Rx4(void *scratchpad, size_t scratchpadSize, void *hash, voi
 
 					rx_prefetch_t0(prefetchPtr);
 					rx_prefetch_t0(prefetchPtr + 64);
+
+					scratchpadPtr += 128;
+					prefetchPtr += 128;
+
 					break;
+
 				default:
 					HASH_STATE(0);
 					FILL_STATE(0);
 					rx_prefetch_t0(prefetchPtr);
 
-					HASH_STATE(1);
+					scratchpadPtr += 64;
-					FILL_STATE(1);
+					prefetchPtr += 64;
-					rx_prefetch_t0(prefetchPtr + 64);
-			}
 
-			scratchpadPtr += 128;
+					break;
-			prefetchPtr += 128;
+			}
 		}
 		prefetchPtr = (const char*) scratchpad;
 		scratchpadEnd += PREFETCH_DISTANCE;