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

runtime/vm/thread_linux.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/thread.h"
+
 #include <errno.h>
 #include <sys/time.h>
 
-#include "vm/thread.h"
-
-#include "vm/assert.h"
+#include "platform/assert.h"
 
 namespace dart {
 
 #define VALIDATE_PTHREAD_RESULT(result) \
   if (result != 0) { \
     FATAL2("pthread error: %d (%s)", result, strerror(result)); \
   }
 
 
 static void ComputeTimeSpec(struct timespec* ts, int64_t millis) {
@@ skipping 220 matching lines @@
 }
 
 
 void Monitor::NotifyAll() {
   // TODO(iposva): Do we need to track lock owners?
   int result = pthread_cond_broadcast(data_.cond());
   VALIDATE_PTHREAD_RESULT(result);
 }
 
 }  // namespace dart