These two transforms previously assumed that the argument to
arrayLength had the form `&struct_var.array_member`. We now also need
to handle the case where it is just `&array_var`.
Bug: tint:1372
Change-Id: I173a84bd32c324445573a295b281a51e291c2ae2
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/76163
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
James Price