This reverts commit 2a446a90.

Reason for revert: This caused regressions on Octane / Jetstream2 /
Sunspider and a couple of regressions on memory usage on mobile:

https://bugs.chromium.org/p/chromium/issues/detail?id=1177124
https://bugs.chromium.org/p/chromium/issues/detail?id=1177241

Original change's description:
> Enable FLAG_feedback_allocation_on_bytecode_size
>
> This flag enables feedback allocation heuristics to be based on the
> function size. The threshold for feedback allocation is set to
> 4 * bytecode size to roughly mimic the allocation after 4 invocations.
>
> Change-Id: Ia840cd526e3718d4267e01c688c6c6467e352d72
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2685175
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Commit-Queue: Mythri Alle <mythria@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72631}

TBR=rmcilroy@chromium.org,mythria@chromium.org,verwaest@chromium.org

Change-Id: Ib756116aa38117c06e95c7f68d8f9ba0acd34084
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2689194Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72651}