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

runtime/vm/pages.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/pages.h"
 
-#include "vm/assert.h"
+#include "platform/assert.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
 #include "vm/object.h"
 #include "vm/virtual_memory.h"
 
 namespace dart {
 
 HeapPage* HeapPage::Initialize(VirtualMemory* memory, bool is_executable) {
   ASSERT(memory->size() > VirtualMemory::PageSize());
   memory->Commit(is_executable);
@@ skipping 255 matching lines @@
     OS::PrintErr(" done.\n");
   }
 
   count_++;
   // Done, reset the marker.
   ASSERT(sweeping_);
   sweeping_ = false;
 }
 
 }  // namespace dart