Test annotate using named rev instead of linkrev

tests/test-annotate

@@ -71,3 +71,6 echo d >> b
 hg ci -mmerge2 -d '4 0'
 echo % annotate after rename merge
 hg annotate -nf b
+
+echo % linkrev vs rev
+hg annotate -r tip a

tests/test-annotate.out

@@ -48,3 +48,7 3 b: b
 4 b: c
 3 b: b
 7 b: d
+% linkrev vs rev
+0: a
+1: a
+1: a