This reverts commit 306bb635.

Reason for revert: Fails on Win64 msvc https://ci.chromium.org/p/v8/builders/ci/V8%20Win64%20-%20msvc/10601

Original change's description:
> [wasm-simd] Implement F64x2ConvertI64x2 for x64
> 
> Bug: v8:8460
> Change-Id: Icefb90c67af77ac93bd75b4e452ba426232de83a
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1710332
> Commit-Queue: Zhi An Ng <zhin@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Bill Budge <bbudge@chromium.org>
> Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#63627}

TBR=bbudge@chromium.org,mstarzinger@chromium.org,gdeepti@chromium.org,zhin@chromium.org

Change-Id: I3ad568ec01f93e89ccc758170681035413b8414e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8460
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1792232Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63628}