This reverts commit b18bc221.

Reason for revert: Rolling back to previous greedy slot allocator.

tbr=jgruber@chromium.org

Original change's description:
> [compiler][linkage] No allocation of slots after aligning a frame
>
> - Adds DCHECKs to make sure no stack slots are allocated after
>   aligning a frame.
> - Changes Arm64 CodeGenerator::FinishFrame to align the frame after
>   allocating callee-saved registers, and relaxes the constraints on
>   the number of callee-saved registers.
>
> Bug: v8:9198
> Change-Id: Iacb0518b57fa3ea2ff801eda69719f4c32733850
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2694104
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Commit-Queue: Bill Budge <bbudge@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72781}

Bug: v8:9198
Change-Id: I53f415b7b0f73b57db24859d1199c6a44f911035
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2713204
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72930}