[runtime] Use UnseededNumberDictionary to encode the array_buffer_transfer_map
SeededNumberDictionaries are used to implement element backing stores of JSObjects, not internally used dictionaries. This saves space for the anyway unused PropertyDetails entry (1/3 fields). Bug: Change-Id: I6fe9fae6de500dd0bcb722f51a7543952c7813e9 Reviewed-on: https://chromium-review.googlesource.com/543343 Commit-Queue: Toon Verwaest <verwaest@chromium.org> Reviewed-by: Camillo Bruni <cbruni@chromium.org> Cr-Commit-Position: refs/heads/master@{#46124}
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