This is a reland of 333615cf after
disabling the failing layout test. I am still investigating the failure
and will re-enable the test as soon as I find a fix. The related bug
is here: crbug.com/976587

Original change's description:
> Reland "Enable lazy feedback allocation"
>
> This is a reland of 8c10501b.
> Reland after fixing test failures.
>
> Original change's description:
> > Enable lazy feedback allocation
> >
> > Bug: v8:8394
> > Change-Id: I29ffd38725bdcaa9dd11221045dba681eb0d567b
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1643430
> > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> > Commit-Queue: Mythri Alle <mythria@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#61991}
>
> Bug: v8:8394
> Change-Id: Icc9e276ab22ca6455b775f3c27e0d43c3f08b887
> TBR: rmcilroy@chromium.org
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1647161
> Reviewed-by: Mythri Alle <mythria@chromium.org>
> Commit-Queue: Mythri Alle <mythria@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#62018}

Bug: v8:8394
Change-Id: I014b14933bfa7f98a2c3666ba5a650917e96a819
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1666999Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62275}