The predicatable mode sets --single-threaded flag, which disables
--wasm-async-compilation. The test relies on async compilation.

Change-Id: I49dae829506c69f21f148cc9c9565c136abcda42
Reviewed-on: https://chromium-review.googlesource.com/880842Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50793}