Minor fixes to subgroupBroadcast tests (#4721) Fix subgroupBroadcast fragment checker bounds and size check: - Exclude the last column using the framebuffer width rather than its height (copy paste error). - Compare each subgroup's size against the number of invocations seen rather than against itself. Skip groups whose broadcasting invocation was not found, since their results are indeterminate.
This is the conformance test suite for WebGPU. It tests the behaviors defined by the WebGPU specification.
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