[heap] Correctly handle strings in concurrent marking.
String with pointers should use snapshotting protocol because they can be externalized concurrently. Sequential strings can be turned into thin strings, so we need to cache the length and synchronized of markbits. No-Try: true Bug: v8:6915, chromium:694255 Change-Id: Ibd1f0ead31544f56aa9de9a177bee7e60fbc2e6a Reviewed-on: https://chromium-review.googlesource.com/708761 Commit-Queue: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#48432}
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