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

tests/compiler/dart2js/cps_ir/expected/runtime_types_4.js

Index: tests/compiler/dart2js/cps_ir/expected/runtime_types_4.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/runtime_types_4.js b/tests/compiler/dart2js/cps_ir/expected/runtime_types_4.js
new file mode 100644
index 0000000000000000000000000000000000000000..823dbe99f237b9f8d55331f3ba2976174bd8c982
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/runtime_types_4.js
@@ -0,0 +1,12 @@
+// Expectation for test: 
+// // Method to test: generative_constructor(C#)
+// class C<X, Y, Z> {
+//   foo() => 'C<$X $Y, $Z>';
+// }
+// main() {
+//   new C<C, int, String>().foo();
+// }
+
+function($X, $Y, $Z) {
+  return H.setRuntimeTypeInfo(new V.C(), [$X, $Y, $Z]);
+}