cmd/bench: run 10 iterations for each bent benchmark

For golang/go#49207.

Change-Id: I83fa87a603cf26ed61d324975166388db1801487
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/382097
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

cmd/bench/bent.go

diff --git a/cmd/bench/bent.go b/cmd/bench/bent.go
index 74471e8..bade299 100644
--- a/cmd/bench/bent.go
+++ b/cmd/bench/bent.go
@@ -107,12 +107,16 @@
 	// Finally we can actually run the benchmarks.
 	// N.B. bent prints the "toolchain" tag to indicate which toolchain is being used.
 	// It's passed to bent via the TOML configuration.
-	cmd = exec.Command(bentPath, "-C", confFile, "-B", filepath.Join(dir, "benchmarks-50.toml"))
+	cmd = exec.Command(bentPath,
+		"-N", "10",
+		"-C", confFile,
+		"-B", filepath.Join(dir, "benchmarks-50.toml"),
+	)
 	cmd.Dir = dir
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	if err := cmd.Run(); err != nil {
-		return fmt.Errorf("error running bent -I: %w", err)
+		return fmt.Errorf("error running bent: %w", err)
 	}
 	return nil
 }