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

tests/compiler/dart2js/cps_ir/expected/operators2_8.js

Index: tests/compiler/dart2js/cps_ir/expected/operators2_8.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/operators2_8.js b/tests/compiler/dart2js/cps_ir/expected/operators2_8.js
new file mode 100644
index 0000000000000000000000000000000000000000..2f1ce60fb82429bd2cd519ec6b688dd0ad4bb0fd
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/operators2_8.js
@@ -0,0 +1,11 @@
+// Expectation for test: 
+// // Method to test: function(foo)
+// foo(a) => a ~/ 13;
+// main() {
+//   print(foo(5));
+//   print(foo(8000000000));
+// }
+
+function(a) {
+  return (a | 0) === a && (13 | 0) === 13 ? a / 13 | 0 : C.JSNumber_methods.toInt$0(a / 13);
+}