Make stress mode collect source positions for functions that weren't
lazily compiled.

Bug: v8:8510
Change-Id: I632f4b39746a7500ced3b7de9840601c4681856e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1700063
Auto-Submit: Dan Elphick <delphick@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62687}