allow streams to marked as exhausted in more cases

At stream boundaries, we can mark streams as exhausted if there are no
groups active and there are no other ways to report matches. This allows us
to stop maintaining the history buffer on subsequent stream writes.
Previously, streams were only marked as exhausted if a pure highlander case
reported all patterns or the outfix in a sole outfix case died.

src/rose/rose_build_add.cpp

@@ -722,7 +722,9 @@ void makeEodEventLeftfix(RoseBuildImpl &build, RoseVertex u,
         RoseEdge e = add_edge(v, w, g);
         g[e].minBound = 0;
         g[e].maxBound = 0;
-        g[e].history = ROSE_ROLE_HISTORY_LAST_BYTE;
+        /* No need to set history as the event is only delivered at the last
+         * byte anyway - no need to invalidate stale entries. */
+        g[e].history = ROSE_ROLE_HISTORY_NONE;
         DEBUG_PRINTF("accept eod vertex (index=%zu)\n", g[w].index);
     }
 }