The {ModuleEnv} already contains a pointer to the {WasmModule}, no need
to pass it explicitly.

R=titzer@chromium.org

Change-Id: Icf0e8ea8b25c33dd5bcaeab2a4a746376e73813d
Reviewed-on: https://chromium-review.googlesource.com/1105828
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53858}