David Neto 9c179a601c wgsl-reader: hex prefix only is an error
These are errors:

    let a = 0x;
    let b = -0x;

Fixes: tint:1338
Change-Id: I9d26ad66e32deb954550c0ecfbda0a9005bcd380
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/72380
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: David Neto <dneto@google.com>
Auto-Submit: David Neto <dneto@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
2021-12-09 22:35:44 +00:00
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