This reverts commit 8092acbe.

Reason for revert: Causes UBSan warnings:
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20UBSan/6436

Original change's description:
> [wasm] Store signature with {WebAssembly.Function} objects.
> 
> This adds simple serialization and deserialization of the signature
> provided when a {WebAssembly.Function} object is constructed. For now
> this signature is only used by the {WebAssembly.Function.type} method,
> but will soon be used when importing such functions as well.
> 
> R=​jkummerow@chromium.org
> TEST=mjsunit/wasm/type-reflection
> BUG=v8:7742
> 
> Change-Id: If4a687ea537d8c12f4f01a7d3ac5a795ceb999c6
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1632211
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#61898}

TBR=jkummerow@chromium.org,mstarzinger@chromium.org

Change-Id: I56ea9df5db3f95c05068186097e298cb73a3675d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7742
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1632218Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61899}