revsetbenchmarks: add an additional roots() benchmark
The existing roots(x - y) revset only considered the most recent 100
revisions. This was a good start. But expanding it to the full history
of the repository can dramatically increase execution time and thus
constitutes a useful benchmark.
workingfilectx.date = (1000, 0)
ASCII : Gr?ezi!
Latin-1 : Grüezi!
UTF-8 : Grüezi!
(['foo'], [], [], [], [], [], [])
diff --git a/foo b/foo
--- a/foo
+++ b/foo
@@ -1,1 +1,2 @@
foo
+bar