fix initialization of null in loops

tests/language/language.status

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # 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.
 
 # This directory contains tests that are intended to show the
 # current state of the language.
 
 # In order to maintain maximum test coverage for all builds,
 # please use the following procedure to mark a test
 # failed on architectures other than the one you are working on.
@@ skipping 300 matching lines @@
 SuperImplicitClosureTest: Fail
 SuperTest: Fail  # this is testing precise ordering of super constructor call
 SwitchLabelTest: Fail
 TryCatch9NegativeTest: Fail
 TypeVariableBoundsTest/none: Fail # Issue 417
 TypeVariableBoundsTest/00: Fail # Issue 417
 TypeVariableBoundsTest/03: Fail # Issue 417
 TypeVariableBoundsTest/04: Fail # Issue 417
 TypeVariableScopeTest/none: Fail # Issue 417
 UnboundGetterTest: Fail
-VarInitTest: Fail
 WrongNumberTypeArgumentsTest: Fail
 ImplicitThisTest/01: Fail # Issue 376
 ImplicitThisTest/02: Fail # Issue 376
 ImplicitThisTest/03: Fail # Issue 376
 ImplicitThisTest/04: Fail # Issue 376
 ImplicitThisTest/none: Fail # Issue 376
 FinalVarNegativeTest: Fail
 
 [ ($component == frogsh ||  $component == frog || $component == leg || $component == frogium) && $unchecked ]
 PrivateMemberTest/01: Fail # test seems bad - see issue #353
@@ skipping 21 matching lines @@
 StaticField2RunNegativeTest: Fail
 
 [ $arch == x64 ]
 *: Skip
 
 [ $arch == simarm ]
 *: Skip
 
 [ $arch == arm ]
 *: Skip