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Collection backings use raw pointers instead of Member so we need manual write barriers.
This CL emits a write barrier on collection backing assignment, and disables promptly free for any marked backings, as they may already be registered in the marking CallbackStack.

Bug: 757440
Change-Id: I56f676808bfa94f468594541f979161b8feb773e
Reviewed-on: https://chromium-review.googlesource.com/931141Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539841}