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

tests/compiler/dart2js/cps_ir/expected/control_flow_2.js

Index: tests/compiler/dart2js/cps_ir/expected/control_flow_2.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/control_flow_2.js b/tests/compiler/dart2js/cps_ir/expected/control_flow_2.js
new file mode 100644
index 0000000000000000000000000000000000000000..79c2ddd1a734ffa04f3002bd84dead1a05c72324
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/control_flow_2.js
@@ -0,0 +1,33 @@
+// Expectation for test: 
+// foo(a) { print(a); return a; }
+// 
+// main() {
+//   while (true) {
+//     l: while (true) {
+//       while (foo(true)) {
+//         if (foo(false)) break l;
+//       }
+//       print(1);
+//     }
+//     print(2);
+//   }
+// }
+
+function() {
+  L1:
+    while (true)
+      L0:
+        while (true)
+          while (true) {
+            P.print(true);
+            if (false) {
+              P.print(1);
+              continue L0;
+            }
+            P.print(false);
+            if (false) {
+              P.print(2);
+              continue L1;
+            }
+          }
+}