And produce a warning if these are used. Hard to test, as we don't want to introduce fake functions in our definition file.
Also add missing cast in EnumMatcher.
Bug: tint:806
Change-Id: I21f189e4befe419f6d5544acfc52387d9a5da782
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/54001
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>