Enable analyzer tests after fixing them for analysis

tests/language/string_interpolation_and_buffer_test.dart

Index: tests/language/string_interpolation_and_buffer_test.dart
diff --git a/tests/language/string_interpolation_and_buffer_test.dart b/tests/language/string_interpolation_and_buffer_test.dart
index 5006d6eaac0549f7aaa7b1cf5e46b947b98fb716..45690277357e1e6e1138d05e60b4fd386aa942ad 100644
--- a/tests/language/string_interpolation_and_buffer_test.dart
+++ b/tests/language/string_interpolation_and_buffer_test.dart
@@ -20,8 +20,9 @@ wrap(value) => new ToStringWrapper(value);
 final bool checkedMode = computeCheckedMode();
 bool computeCheckedMode() {
   try {
-    int x = "foo";
-  } on Error {
+    var i = 42;
+    String s = i;
+  } on TypeError catch (e) {
     return true;
   }
   return false;