Add more subtype checks, and repeat them so that any inlined checks can be tested as well (first te…

tests/language/src/Instanceof3Test.dart

Index: tests/language/src/Instanceof3Test.dart
===================================================================
--- tests/language/src/Instanceof3Test.dart	(revision 7030)
+++ tests/language/src/Instanceof3Test.dart	(working copy)
@@ -16,7 +16,7 @@
   }
 }
 
-main() {
+testAll() {
   {
     bool got_type_error = false;
     var x = null;
@@ -84,3 +84,10 @@
     Expect.isTrue(got_type_error == isCheckedMode());
   }
 }
+
+main() {
+  // Repeat type checks so that inlined tests can be tested as well.
+  for (int i = 0; i < 5; i++) {
+    testAll();
+  }
+}