In off-thread compilation, the ParseInfo is released on the background
thread. We have to make sure to that the OffThreadParseInfoScope doesn't
try to reset its per-thread data in this case.

Bug: chromium:1011762
Change-Id: I6ddad6508cacc18f29e020e373783da64d3e4cb7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2115431Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66860}