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

tests/compiler/dart2js/cps_ir/expected/literals_1.js

Index: tests/compiler/dart2js/cps_ir/expected/literals_1.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/literals_1.js b/tests/compiler/dart2js/cps_ir/expected/literals_1.js
new file mode 100644
index 0000000000000000000000000000000000000000..ef654f52c8fbcbf8836fb9e182f0de5442e84f98
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/literals_1.js
@@ -0,0 +1,20 @@
+// Expectation for test: 
+// main() {
+//   print([]);
+//   print([1]);
+//   print([1, 2]);
+//   print([1, [1, 2]]);
+//   print({});
+//   print({1: 2});
+//   print({[1, 2]: [3, 4]});
+// }
+
+function() {
+  P.print([]);
+  P.print([1]);
+  P.print([1, 2]);
+  P.print([1, [1, 2]]);
+  P.print(P.LinkedHashMap_LinkedHashMap$_empty());
+  P.print(P.LinkedHashMap_LinkedHashMap$_literal([1, 2]));
+  P.print(P.LinkedHashMap_LinkedHashMap$_literal([[1, 2], [3, 4]]));
+}