dan sinclair ce6246502c Add global_directive rule to the WGSL parser.
This CL adds the `global_directive` rule into the WGSL parser and
moves `enable_directive` under that rule. This matches the WGSL
specification.

Bug: tint:1633
Change-Id: I48b809cd1d2f2ffa6ec0d83474c716d4015e1dea
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/98041
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@chromium.org>
Reviewed-by: Ben Clayton <bclayton@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
2022-08-02 21:17:05 +00:00
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