This CL fixes several unrelated failures with --no-wasm-jit-to-native.
A follow-up CL will then add a new test variant with that flag.

R=ahaas@chromium.org

Bug: v8:7417
Change-Id: I40a7be53a50d0efbbec8de49aceeb4a43a1f41de
Reviewed-on: https://chromium-review.googlesource.com/909212Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51200}