.. where we sometimes want to inspect Node contents. With this CL, for
a human-readable print in gdb:

 print node->Print()

Note: Since we use an adhoc-created graph labeller, the output can't
properly identify input nodes and instead prints them as 'unregistered
node'.

Bug: v8:7700
Change-Id: Icba458ac1a5c43a09b815e12582443aca4e19380
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3890914
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83151}