We were returning too early. Don't double-log the script, but log all
source-code-infos within it.

Bug: v8:7018
Change-Id: Icd29905ee1ae3444e30760cae0b0a18b55440335
Reviewed-on: https://chromium-review.googlesource.com/808165Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49861}