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Generational barrier is needed to track inter-generational pointers in
the remembered set (which is implemented as a card table). The barrier
is implemented under a macro flag BLINK_HEAP_YOUNG_GENERATION and is off
by default.

Design doc: https://bit.ly/2ZXGU20

Bug: 1029379
Change-Id: I9931c409d119d35e85185970cff0a62f1171fc6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2000726Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738952}