Add comment regarding fixed UB

common/common.cpp

@@ -1700,6 +1700,7 @@ void dump_kv_cache_view_seqs(const llama_kv_cache_view & view, int row_size) {
             if (cs_curr[j] < 0) { continue; }
             if (seqs.find(cs_curr[j]) == seqs.end()) {
                 if (seqs.size() + 1 >= sizeof(slot_chars)) { break; }
+                // combining the following two lines will result in an UB: https://pvs-studio.com/en/docs/warnings/v708/
                 auto current_size = seqs.size();
                 seqs[cs_curr[j]] = current_size;
             }