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

tests/compiler/dart2js/cps_ir/input/basic_1.dart

Index: tests/compiler/dart2js/cps_ir/input/basic_1.dart
diff --git a/tests/compiler/dart2js/cps_ir/input/basic_1.dart b/tests/compiler/dart2js/cps_ir/input/basic_1.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ee77081836e7b3e3ed68e20686e9f78fe5803d2d
--- /dev/null
+++ b/tests/compiler/dart2js/cps_ir/input/basic_1.dart
@@ -0,0 +1,14 @@
+main() {
+  var e = 1;
+  var l = [1, 2, 3];
+  var m = {'s': 1};
+
+  print('(' ')');
+  print('(${true})');
+  print('(${1})');
+  print('(${[1, 2, 3]})');
+  print('(${{'s': 1}})');
+  print('($e)');
+  print('($l)');
+  print('($m)');
+}