write a quick benchmark

lfs/scanner_test.go

@@ -246,3 +246,13 @@ func TestLsTreeParser(t *testing.T) {
 		t.Errorf("Bad name: %q", blob.Filename)
 	}
 }
+
+func BenchmarkLsTreeParser(b *testing.B) {
+	stdout := "100644 blob d899f6551a51cf19763c5955c7a06a2726f018e9      42	.gitattributes\000100644 blob 4d343e022e11a8618db494dc3c501e80c7e18197     126	PB SCN 16 Odhrán.wav"
+	blobs := make(chan TreeBlob, b.N*2)
+	// run the Fib function b.N times
+	for n := 0; n < b.N; n++ {
+		parseLsTree(strings.NewReader(stdout), blobs)
+	}
+	close(blobs)
+}