Track void context.

test/kernel/regression/for_loop.dart

Index: test/kernel/regression/for_loop.dart
diff --git a/test/kernel/regression/issue_000011.dart b/test/kernel/regression/for_loop.dart
similarity index 56%
copy from test/kernel/regression/issue_000011.dart
copy to test/kernel/regression/for_loop.dart
index 26790daa1891f77c367ca46422f21e5029567693..0155ab357fc2fb4570a05b7b4ec5c6b69e0979af 100644
--- a/test/kernel/regression/issue_000011.dart
+++ b/test/kernel/regression/for_loop.dart
@@ -3,9 +3,11 @@
 // BSD-style license that can be found in the LICENSE.md file.
 
 main() {
-  try {
-    print(42);
-  } finally {
-    print(87);
+  int c = new DateTime.now().millisecondsSinceEpoch;
+  for (int i = 0; i < 100; i++) {
+    print(i++);
+  }
+  for (int i = 0; i < 100; c < 42 ? throw "fisk" : i++) {
+    print(i++);
   }
 }