Enhance gcmole --verbose printing with the GC suspect.

Bug: v8:9986
Change-Id: Ia1454d4edec334eabb31a764583e4ee559f0fe07
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2207174Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67867}