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

tests/compiler/dart2js/cps_ir/input/constructor_6.dart

Index: tests/compiler/dart2js/cps_ir/input/constructor_6.dart
diff --git a/tests/compiler/dart2js/cps_ir/input/constructor_6.dart b/tests/compiler/dart2js/cps_ir/input/constructor_6.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f1c6b519294bc1159bc51fc8861afad5cde2ebcc
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/input/constructor_6.dart
@@ -0,0 +1,16 @@
+class Bar {
+  Bar(x, {y, z: 'z', w: '_', q}) {
+    print(x);
+    print(y);
+    print(z);
+    print(w);
+    print(q);
+  }
+}
+class Foo extends Bar {
+  Foo() : super('x', y: 'y', w: 'w');
+}
+main() {
+  new Foo();
+}
+