Move assert.h/assert.cc from runtime/vm to runtime/platform

runtime/vm/snapshot_test.cc

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, 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.
 
-#include "vm/snapshot.h"
-
-#include "vm/assert.h"
+#include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
+#include "vm/snapshot.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 // Check if serialized and deserialized objects are equal.
 static bool Equals(const Object& expected, const Object& actual) {
   if (expected.IsNull()) {
     return actual.IsNull();
   }
   if (expected.IsSmi()) {
@@ skipping 500 matching lines @@
     Dart_ExitScope();
   }
   Dart_ShutdownIsolate();
   free(full_snapshot);
   free(script_snapshot);
 }
 
 #endif  // TARGET_ARCH_IA32.
 
 }  // namespace dart