This reverts commit 6ca3adb9.

Reason for revert: Build failed with V8_MAP_PACKING

Original change's description:
> [ptr-compr][x64][compiler] Support load map in compressed form
>
> ...to allow pointer decompression at use-site.
>
> Bug: v8:13056, v8:7703
> Change-Id: If369286814c76340a945cc2a9fd863888a813080
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3811737
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Hao A Xu <hao.a.xu@intel.com>
> Cr-Commit-Position: refs/heads/main@{#82242}

Bug: v8:13056, v8:7703
Change-Id: I01b6ea880c656b66392cb8eb47f7c80d8c0e4936
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3815777
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82244}