Revert of [wasm] re-enable simd-scalar-lowering tests (patchset #1 id:1 of https://codereview.chromium.org/2754393002/ )

Reason for revert:
Seems like this is breaking V8 Linux - arm64 - sim - MSAN

Original issue's description:
> [wasm] re-enable simd-scalar-lowering tests
>
> R=bbudge@chromium.org
> BUG=v8:6020
>
> Review-Url: https://codereview.chromium.org/2754393002
> Cr-Commit-Position: refs/heads/master@{#43918}
> Committed: https://chromium.googlesource.com/v8/v8/+/931714675b3ac323d7121e275c4fe7ff32f59eec

TBR=bbudge@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:6020

Review-Url: https://codereview.chromium.org/2749023010
Cr-Commit-Position: refs/heads/master@{#43919}