Add a test for fallthrough

Author: tmr232

src/test/nodecount.go

@@ -58,3 +58,19 @@ func trivialReachability() {
 	// CFG: a
 	// CFG: b
 }
+
+/*
+reaches: [
+	["A", "B"]
+]
+*/
+func hasFallthrough() {
+	switch 1 {
+	case 1:
+		// CFG: A
+		fallthrough
+	case 2:
+		// CFG: B
+		"Include me!"
+	}
+}