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This fixes a crash when loading snapshots that contain empty ArrayBuffer instances: ```js const X = []; X.push(new ArrayBuffer()); v8.startupSnapshot.setDeserializeMainFunction(() => { for (let i = 0; i < 1000000; i++) { // trigger GC X.push(new ArrayBuffer()); } }) ``` Original commit message: [sandbox] Sandboxify JSArrayBuffer::extension external pointer Bug: chromium:1335043 Change-Id: Id8e6883fc652b144f6380ff09b1c18e777e041c2 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3706626 Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Igor Sheludko <ishell@chromium.org> Commit-Queue: Samuel Groß <saelo@chromium.org> Cr-Commit-Position: refs/heads/main@{#84544} Refs: v8/v8@8ca9f77 PR-URL: #45871 Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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