Generates expected cases that fail, using a SKIP header
Change-Id: I2738fa2cf47c715fe6e978edf51aa928c5e3b216
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/53049
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@chromium.org>
Reviewed-by: James Price <jrprice@google.com>