dan sinclair bf586f6dfd Remove fallthrough from WGSL parser.
This CL removes the `fallthrough` parsing from the WGSL parser. The
`fallthrough` token is left so we can generate a nicer error message
in the case `fallthrough` is used.

Bug: tint:1644
Change-Id: Ifb23d78d1219cba9c64b80c9b098a248bc68e5c5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/109001
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
2022-11-15 00:20:24 +00:00
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