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

runtime/vm/object_arm_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 "platform/assert.h"
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
-#include "vm/assert.h"
 #include "vm/object.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 #define __ assembler->
 
 
 // Generate a simple dart code sequence.
 // This is used to test Code and Instruction object creation.
@@ skipping 11 matching lines @@
 
 // Generate a dart code sequence that embeds a smi object in it.
 // This is used to test Embedded Smi objects in the instructions.
 void GenerateEmbedSmiInCode(Assembler* assembler, intptr_t value) {
   __ Unimplemented("GenerateEmbedSmiInCode");
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM