Don't repeat common prefix search in addWriteRange

ConflictSet.cpp

@@ -1334,9 +1334,6 @@ void addWriteRange(Node *&root, int64_t oldestVersion,
 
   int consumed = lcp - remaining.size();
 
-  consumed = 0;
-  useAsRoot = &root;
-
   begin = begin.subspan(consumed, begin.size() - consumed);
   end = end.subspan(consumed, end.size() - consumed);