Land Ivan's change of 'Remove support for verified memory handling'

runtime/vm/verified_memory.cc

-// Copyright (c) 2014, 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/verified_memory.h"
-
-namespace dart {
-
-#if defined(DEBUG)
-
-DEFINE_FLAG(bool, verified_mem, false,
-            "Enable write-barrier verification mode (slow, DEBUG only).");
-DEFINE_FLAG(int, verified_mem_max_reserve_mb, (kWordSize <= 4) ? 16 : 32,
-            "When verified_mem is true, largest supported reservation (MB).");
-
-
-VirtualMemory* VerifiedMemory::ReserveInternal(intptr_t size) {
-  if (size > offset()) {
-    FATAL1("Requested reservation of %" Pd " bytes exceeds the limit. "
-           "Use --verified_mem_max_reserve_mb to increase it.", size);
-  }
-  VirtualMemory* result = VirtualMemory::Reserve(size + offset());
-  if (result != NULL) {
-    // Commit the offset part of the reservation (writable, not executable).
-    result->Commit(result->start() + offset(), size, /* executable = */ false);
-    // Truncate without unmapping, so that the returned object looks like
-    // a normal 'size' bytes reservation (but VirtualMemory will correctly
-    // unmap the entire original reservation on destruction).
-    result->Truncate(size, /* try_unmap = */ false);
-  }
-  return result;
-}
-
-#endif  // DEBUG
-
-}  // namespace dart