Output nullptr pointer parameters correctly. Fix by piping all pointer value parameter output to const void *, which has a custom handler. This fixes a case where non-void pointers were being output as (nil) or other values. Fixes the Capture/Replay tests for many cases. Bug: angleproject:5249 Change-Id: I20c9e605d9c5a36e36e7a3d6c753a4e0de94ac4c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2497563 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>