add another bullet point to futurework in chapter 7

thesis/content/70_conclusion.tex

@@ -27,6 +27,7 @@
 \todo{write this section}
 
 \begin{itemize}
+    \item analyse whether prefetching yields better performance than hbm caching mode \cite{intel:xeonmaxbrief}
     \item evaluate impact of lock contention and atomics on performance
     \item provide optimized use case specific versions with less locking
     \item extend the cache implementation use cases where data is not static