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Members in stack allocated types issue redundant write-barriers. This CL
provides an option --no-members-in-gc-allocated, which prohibits use of
them.

Bug: 1044611
Change-Id: Icc83756d9a1d6e414a09b705c0f008f9e79c4ae9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010986
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734022}