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

tests/compiler/dart2js/cps_ir/expected/closures_14.js

Index: tests/compiler/dart2js/cps_ir/expected/closures_14.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/closures_14.js b/tests/compiler/dart2js/cps_ir/expected/closures_14.js
new file mode 100644
index 0000000000000000000000000000000000000000..d2e7ff91a5f12517346eb66fedfbf3871d9d463d
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/closures_14.js
@@ -0,0 +1,20 @@
+// Expectation for test: 
+// class Foo {
+//   get getter {
+//     print('getter');
+//     return (x) => x;
+//   }
+// }
+// main(x) {
+//   var notTearOff = new Foo().getter;
+//   print(notTearOff(123));
+//   print(notTearOff(321));
+// }
+
+function(x) {
+  var v0 = new V.Foo_getter_closure();
+  V.Foo$();
+  P.print("getter");
+  P.print(v0.call$1(123));
+  P.print(v0.call$1(321));
+}