This makes sure the aforementioned predicate is independent of the
current context (aka. Realm) and only uses the instance type of the
given object to determine whether it is a WebAssembly module object.

R=titzer@chromium.org
TEST=mjsunit/regress/wasm/regress-8059
BUG=v8:8059

Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: Icc8e400f8412483f2a3883ca65c58b7ef938ef23
Reviewed-on: https://chromium-review.googlesource.com/1180886Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55205}