Revert "cppgc, heap: Don't eagerly allocate worklist segments"

This reverts commit c99147c6.

Reason for revert: Breaks UBSan - https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20UBSan/12773?

Original change's description:
> cppgc, heap: Don't eagerly allocate worklist segments
> 
> Bug: chromium:1056170
> Change-Id: I75a6b5f52bfe8dd71abc086e5d1e060759ad7fc0
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2391254
> Commit-Queue: Omer Katz <omerkatz@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#69778}

TBR=ulan@chromium.org,mlippautz@chromium.org,omerkatz@chromium.org

Change-Id: Icf1b1a333b5f1b683c816c65662207914996e325
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1056170
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2401422Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69781}

BUILD.gn

@@ -4255,7 +4255,6 @@ v8_source_set("v8_cppgc_shared") {
   sources = [
     "src/heap/base/stack.cc",
     "src/heap/base/stack.h",
-    "src/heap/base/worklist.cc",
     "src/heap/base/worklist.h",
   ]
 

src/heap/base/worklist.cc

-// Copyright 2020 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/heap/base/worklist.h"
-
-namespace heap {
-namespace base {
-namespace internal {
-SegmentBase SegmentBase::kSentinelSegment(0);
-}  // namespace internal
-}  // namespace base
-}  // namespace heap