Enable issue tests that appear to be incorrectly named.

tests/language/issue21159_test.dart

Index: tests/language/issue21159_test.dart
diff --git a/tests/language/isssue_21159.dart b/tests/language/issue21159_test.dart
similarity index 50%
rename from tests/language/isssue_21159.dart
rename to tests/language/issue21159_test.dart
index 2d2b6c858ce7d8ed32049886a6179abe922f82b3..0130b95205d2dd87a9dabd4e9f27675d0cf2ef25 100644
--- a/tests/language/isssue_21159.dart
+++ b/tests/language/issue21159_test.dart
@@ -2,10 +2,23 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import "package:expect/expect.dart";
+
 class C {
  get call => this;
 }
 
-main() {
+// Recurs outside the try-block to avoid disabling inlining.
+foo() {
  new C()();
 }
+
+main() {
+ bool exceptionCaught = false;
+ try {
+  foo();
+ } on StackOverflowError catch (e) {
+  exceptionCaught = true;
+ }
+ Expect.equals(true, exceptionCaught);
+}