This makes sure the "parameters" and "results" properties of the passed
FunctionType object can be arbitrary iterable objects, not just plain
JavaScript arrays.

R=clemensh@chromium.org
TEST=mjsunit/wasm/type-reflection
BUG=v8:7742

Change-Id: Icba18c418e549deba9fff1855be4956813b1a953
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1733071
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63049}