This reverts commit adb5e163.

Reason for revert: ClusterFuzz ain't happy. (crbug.com/1356461 and others)

Original change's description:
> [turbofan][x64] When spilling 32bit values, reload only 32 bits
>
> When we spill a register that we know contains only 32 interesting bits
> and then reload it from the spill slot, it's enough to reload its lower
> half. This may save a few bytes, and guards against accidental changes
> to the upper half (e.g. via pointer decompression).
>
> Bug: v8:13216
> Change-Id: I1d950d6e33d8ae94cf385af4f3e1db028bf333c5
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3854506
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82704}

Bug: v8:13216
Change-Id: I8923cbe00c73191f2fdd51f361d7cd073f338a00
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3859323Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#82750}