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

runtime/vm/verifier.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/verifier.h"
 
-#include "vm/assert.h"
+#include "platform/assert.h"
 #include "vm/dart.h"
 #include "vm/dart_api_state.h"
 #include "vm/freelist.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
 #include "vm/stack_frame.h"
 
 namespace dart {
@@ skipping 33 matching lines @@
   NoGCScope no_gc;
   Isolate* isolate = Isolate::Current();
   VerifyPointersVisitor visitor;
   isolate->VisitObjectPointers(&visitor,
                                StackFrameIterator::kValidateFrames);
   VerifyWeakPointersVisitor weak_visitor(&visitor);
   isolate->VisitWeakPersistentHandles(&weak_visitor);
 }
 
 }  // namespace dart