Defers some work in the non-asm.js case

Change-Id: Id20863fb2af83148271408b0242d49e03be29d3b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1682213
Commit-Queue: Bill Budge <bbudge@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62580}