The ValidateFunction method just required the current pipeline stage.
Provide the stage directly instead of using current_function.
Bug: tint:1313
Change-Id: I0c12bef4b28b9cecfbd2b9d7d336a8ff3f8c3a77
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/87144
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>