This is a reland of 2338a2fd

Original change's description:
> [wasm] Add simd mem and shift ops to interpreter
>
> R=clemensh@chromium.org
> BUG=v8:6020
>
> Change-Id: I5d95e4c23240ae4e174d896d31e1b9b1d89d9418
> Reviewed-on: https://chromium-review.googlesource.com/1096493
> Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
> Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#53717}

Bug: v8:6020
Change-Id: I38a73f5e389617a05a12e0a9477544c4e3aa2883
Reviewed-on: https://chromium-review.googlesource.com/1099895Reviewed-by: Ben Smith <binji@chromium.org>
Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53722}