Remove insane overlapping bit ranges from epoch.c
..and move the DUPCHECK to rev-list.c since both the merge-order and the
upcoming topo-sort get confused by dups.
diff --git a/epoch.h b/epoch.h
index 0c1385a..7493d5a 100644
--- a/epoch.h
+++ b/epoch.h
@@ -10,12 +10,12 @@
int sort_list_in_merge_order(struct commit_list *list, emitter_func emitter);
-#define UNINTERESTING (1u<<2)
-#define BOUNDARY (1u<<3)
-#define VISITED (1u<<4)
-#define DISCONTINUITY (1u<<5)
-#define DUPCHECK (1u<<6)
-#define LAST_EPOCH_FLAG (1u<<6)
+/* Low bits are used by rev-list */
+#define UNINTERESTING (1u<<10)
+#define BOUNDARY (1u<<11)
+#define VISITED (1u<<12)
+#define DISCONTINUITY (1u<<13)
+#define LAST_EPOCH_FLAG (1u<<14)
#endif /* EPOCH_H */
