The reference to the {NativeModule} (stored in a {Managed}) should live
on the {WasmModuleObject}, not on the individual {WasmCompiledModule}
objects.

R=titzer@chromium.org

Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I21dfa088c9643d36d9fd5052a145e7e2af5e47f9
Reviewed-on: https://chromium-review.googlesource.com/1106380
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53860}