[objects] Disallow externalizing RO_SPACE 2-byte strings
This was already the case for 1-byte strings. This prevents crashes when attempting to externalize such strings. Bug: chromium:842078, v8:7464 Change-Id: I3092a6748edaf77b2689f7b6f6b949929998e508 Reviewed-on: https://chromium-review.googlesource.com/1054290Reviewed-by: Leszek Swirski <leszeks@chromium.org> Commit-Queue: Dan Elphick <delphick@chromium.org> Cr-Commit-Position: refs/heads/master@{#53124}
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