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

tests/compiler/dart2js/cps_ir/expected/basic_8.js

Index: tests/compiler/dart2js/cps_ir/expected/basic_8.js
diff --git a/tests/compiler/dart2js/cps_ir/expected/basic_8.js b/tests/compiler/dart2js/cps_ir/expected/basic_8.js
new file mode 100644
index 0000000000000000000000000000000000000000..1d8cccdefb0cf39ac070d183a2637b85846d3201
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/expected/basic_8.js
@@ -0,0 +1,10 @@
+// Expectation for test: 
+// main() {
+//   print(new Set());
+//   print(new Set.from([1, 2, 3]));
+// }
+
+function() {
+  P.print(P._LinkedHashSet$(null));
+  P.print(P.LinkedHashSet_LinkedHashSet$from([1, 2, 3], null));
+}