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

runtime/vm/assembler_arm.h

-// 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.
 
 #ifndef VM_ASSEMBLER_ARM_H_
 #define VM_ASSEMBLER_ARM_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm.h directly; use assembler.h instead.
 #endif
 
-#include "vm/assert.h"
+#include "platform/assert.h"
 #include "vm/constants_arm.h"
 
 namespace dart {
 
 #if defined(TESTING) || defined(DEBUG)
 
 #define CHECK_STACK_ALIGNMENT {                                                \
   UNIMPLEMENTED();                                                             \
 }
 
@@ skipping 87 matching lines @@
 
  private:
   ZoneGrowableArray<int>* pointer_offsets_;
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_