cpsir unittests: move all unittests into individual files and test runners.

tests/compiler/dart2js/cps_ir/input/control_flow_9.dart

Index: tests/compiler/dart2js/cps_ir/input/control_flow_9.dart
diff --git a/tests/compiler/dart2js/cps_ir/input/control_flow_9.dart b/tests/compiler/dart2js/cps_ir/input/control_flow_9.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7e59e5a96d191f216bafe4296d705949ecdf8042
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/input/control_flow_9.dart
@@ -0,0 +1,8 @@
+main() {
+  var xs = ['x', 'y', 'z'], ys = ['A', 'B', 'C'];
+  var xit = xs.iterator, yit = ys.iterator;
+  while (xit.moveNext() && yit.moveNext()) {
+    print(xit.current);
+    print(yit.current);
+  }
+}