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

tests/compiler/dart2js/cps_ir/input/constructor_10.dart

Index: tests/compiler/dart2js/cps_ir/input/constructor_10.dart
diff --git a/tests/compiler/dart2js/cps_ir/input/constructor_10.dart b/tests/compiler/dart2js/cps_ir/input/constructor_10.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1e3dddc5165c2467eca46f0934c5ed8b38bc495f
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/input/constructor_10.dart
@@ -0,0 +1,11 @@
+// Method to test: generative_constructor(C#)
+class C<T> {
+  var x;
+  C() : x = new D<T>();
+}
+class D<T> {
+  foo() => T;
+}
+main() {
+  print(new C<int>().x.foo());
+}