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

tests/compiler/dart2js/cps_ir/expected/constructor_5.js

Index: tests/compiler/dart2js/cps_ir/expected/constructor_5.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/constructor_5.js b/tests/compiler/dart2js/cps_ir/expected/constructor_5.js
new file mode 100644
index 0000000000000000000000000000000000000000..ed704e15f8a5c6bd41ac8836b6caa27175a511ec
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/constructor_5.js
@@ -0,0 +1,28 @@
+// Expectation for test: 
+// foo(x) {
+//   print(x);
+// }
+// class Base {
+//   var x1 = foo('x1');
+//   var x2;
+//   var x3 = foo('x3');
+//   Base() : x2 = foo('x2');
+// }
+// class Sub extends Base {
+//   var y1 = foo('y1');
+//   var y2;
+//   var y3;
+//   Sub() : y2 = foo('y2'), super(), y3 = foo('y3');
+// }
+// main() {
+//   new Sub();
+// }
+
+function() {
+  V.foo("y1");
+  V.foo("y2");
+  V.foo("x1");
+  V.foo("x3");
+  V.foo("x2");
+  V.foo("y3");
+}