Avoid casting to {void*} just for printing with "%p". Instead, use the
standard "PRIxPTR", prefixed with "0x". This allows to directly print
addresses.

Drive-by: Remove other unneeded pointer casts; "%p" accepts any pointer
          type.

R=mstarzinger@chromium.org

Bug: v8:9183
Change-Id: I38c9575babaf04689fbd4568c90d593c5a591540
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1627339
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61800}