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

tests/compiler/dart2js/cps_ir/expected/codeUnitAt_1.js

Index: tests/compiler/dart2js/cps_ir/expected/codeUnitAt_1.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/codeUnitAt_1.js b/tests/compiler/dart2js/cps_ir/expected/codeUnitAt_1.js
new file mode 100644
index 0000000000000000000000000000000000000000..5cd7eab5329e6d634126f16ab0e799325fa9396a
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/codeUnitAt_1.js
@@ -0,0 +1,18 @@
+// Expectation for test: 
+// // Constant folding
+// main() {
+//   print('A'.codeUnitAt(0));
+// }
+
+function() {
+  var v0 = "" + 65;
+  if (typeof dartPrint == "function")
+    dartPrint(v0);
+  else if (typeof console == "object" && typeof console.log != "undefined")
+    console.log(v0);
+  else if (!(typeof window == "object")) {
+    if (!(typeof print == "function"))
+      throw "Unable to print message: " + String(v0);
+    print(v0);
+  }
+}