This reverts commit 01a6b6d9.

Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Arm%20-%20debug/20669/overview

Original change's description:
> Reland "[wasm] Update spec tests"
>
> SIMD tests moved from the proposal directory to the main spec test
> directory. Test expectations needed to be adjusted therefore.
>
> Change-Id: I02225da1f55ba173bbda22257edf45a3e987ba0d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3302795
> Commit-Queue: Andreas Haas <ahaas@chromium.org>
> Reviewed-by: Maya Lekova <mslekova@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#78101}

Change-Id: I7bdd6346e5ad593e7fe4289b5d6e15f9235ea26f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3302800
Auto-Submit: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Nico Hartmann <nicohartmann@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#78103}