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

tests/compiler/dart2js/cps_ir/expected/argument_refinement_17.js

Index: tests/compiler/dart2js/cps_ir/expected/argument_refinement_17.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/argument_refinement_17.js b/tests/compiler/dart2js/cps_ir/expected/argument_refinement_17.js
new file mode 100644
index 0000000000000000000000000000000000000000..1fb28670c28e8a76421d325b44c37af85a635aee
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/argument_refinement_17.js
@@ -0,0 +1,19 @@
+// Expectation for test: 
+// main() {
+//   var x = int.parse('1233');
+//   var y = int.parse('1234');
+//   print(x is num);
+//   print(y is num);
+//   print(x * y);
+//   print(x is num);
+//   print(y is num);
+// }
+
+function() {
+  var x = P.int_parse("1233", null, null), y = P.int_parse("1234", null, null), v0 = typeof x === "number", v1 = typeof y === "number";
+  P.print(v0);
+  P.print(v1);
+  P.print(J.$mul$ns(x, y));
+  P.print(v0);
+  P.print(v1);
+}