Too often, maglev has an issue during graph building. These are hard to
debug, because failing to build a graph means that no graph can be
printed. This patch adds a tracing printer that dumps out nodes as they
are added to the graph -- it doesn't have the beautiful unicode arrows,
but at least it's something.

Bug: v8:7700
Change-Id: Id6673a9ee2436eac365d6d449dd2fa49bdc354d0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3780527Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81926}