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

runtime/vm/disassembler_x64.cc

Index: runtime/vm/disassembler_x64.cc
diff --git a/runtime/vm/disassembler_x64.cc b/runtime/vm/disassembler_x64.cc
index 98142a68b8638c53df856e868871d626b3795691..8787ae1763b8caf5b8944a16c1d4d17ac98912ca 100644
--- a/runtime/vm/disassembler_x64.cc
+++ b/runtime/vm/disassembler_x64.cc
@@ -1,7 +1,9 @@
-// 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/disassembler.h"
+
 #if !defined(_WIN32)  // Disassembler is not yet supported under WIN32.
 #include <errno.h>
 #include <stdio.h>
@@ -9,13 +11,10 @@
 #include <unistd.h>
 #endif
 
+#include "platform/assert.h"
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
-#include "vm/disassembler.h"
-
-#include "vm/assert.h"
-
 namespace dart {
 
 void Disassembler::Disassemble(uword start,