This fixes the operation functions (i.e. WebIDL interface member and
namespace member operations) for WebAssembly to not have 'prototype'
properties and not be marked as constructors.

R=ahaas@chromium.org
TEST=mjsunit/wasm/js-api
BUG=chromium:1027945

Change-Id: I4db753a9ca570b95c45cb033c36de65bcafafe8f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1950483Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65329}