Enabling background code assembly broke --code-comments. This CL "fixes"
it for now by simply skipping the printing of inlining stack info.

R=bmeurer@chromium.org

Bug: v8:6048
Change-Id: I8b9ea629c7c302198484510a7234014bfbfd890b
Reviewed-on: https://chromium-review.googlesource.com/569163Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46617}