Helps to avoid explicitly using reinterpret_cast
Change-Id: I4df0e7094c7d8460385c6f23dac529ace9df9bdc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/67605
Auto-Submit: Austin Eng <enga@chromium.org>
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>