dan sinclair 2788becd09 Add element_count_expression to WGSL parser
This CL adds the `element_count_expression` and the requisite math
expression parsing to support along with tests.

Bug: tint:1633

Change-Id: I54ab37339754217f417f69dcd6140adbc14cbf83
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/99560
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
2022-08-19 21:26:01 +00:00
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