Revert "Only emit typeguards if we think they are valuable."

tests/language/src/ListDoubleIndexInLoop2Test.dart

Index: tests/language/src/ListDoubleIndexInLoop2Test.dart
diff --git a/tests/language/src/ListDoubleIndexInLoop2Test.dart b/tests/language/src/ListDoubleIndexInLoop2Test.dart
index 59e0dddf70de62a630d521d817b69f97dd708dd0..2a0ebd7acc8371342c556b89a32e7bc403092e67 100644
--- a/tests/language/src/ListDoubleIndexInLoop2Test.dart
+++ b/tests/language/src/ListDoubleIndexInLoop2Test.dart
@@ -23,11 +23,9 @@ foo(a) {
   } else {
     i = 0;
   }
-  for (int j = 0; j < 1; j++) {
-    // The phi, combining the two 'i's must reach the conclusion that i is of
-    // type num and therefore needs a check before accessing the array.
-    a[i];
-  }
+  // The phi, combining the two 'i's must reach the conclusion that i is of
+  // type num and therefore needs a check before accessing the array.
+  a[i];
 }
 
 main() {