Revert of Pool implementation for zone segments

src/zone/zone-segment.cc

Index: src/zone/zone-segment.cc
diff --git a/src/zone/zone-segment.cc b/src/zone/zone-segment.cc
deleted file mode 100644
index 1fa49d49ba8b328b86fc5d9e147edcc5060e7e4b..0000000000000000000000000000000000000000
--- a/src/zone/zone-segment.cc
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/zone/zone-segment.h"
-
-namespace v8 {
-namespace internal {
-
-void Segment::ZapContents() {
-#ifdef DEBUG
-  memset(start(), kZapDeadByte, capacity());
-#endif
-}
-
-void Segment::ZapHeader() {
-#ifdef DEBUG
-  memset(this, kZapDeadByte, sizeof(Segment));
-#endif
-}
-
-}  // namespace internal
-}  // namespace v8