James Price 1c02eb8cb0 validation: Require interpolate(flat) for integers
This was made a warning in M97, and can now become a hard error.

Fixed: tint:1224
Change-Id: Ied72f6e28b3dc64a6ab832e0eac53f62ce045d40
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/77700
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>
Commit-Queue: James Price <jrprice@google.com>
2022-01-25 01:01:39 +00:00
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