This was missed when changing Object to hold a ptr field instead of
abusing the this pointer.

This was printing the stack address of the particular Object rather
than the location of the printed code object on the heap.

Change-Id: I5c884464419debcbc70b73fe8bdfa8107f2bdb71
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1833681
Auto-Submit: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64065}