This reverts commit 319e747a.

Reason for revert: it brought unexpected performance regressions.

Original change's description:
> [arm64] Increase code alignment to 64
>
> This should fix unexpected regressions which occur after builtins
> modifications.
>
> This CL affects alignment of embedded builtins on all configurations
> and Code header size only for non-pointer compression configuration.
>
> Bug: v8:11708
> Change-Id: I8058197c5b768a699e7f52446424013e86203b57
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3700392
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#81113}

Bug: v8:11708
Change-Id: I238e799284d59e80dee244b240fe2a72c33e83b0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3716485
Auto-Submit: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#81292}