Sitelet https://github.com/gpuweb/gpuweb/issues/750
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Workgroup Size builtin decoration restrictions. #750

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@dj2

In Vulkan the WorkgroupSize can only be attached to a specialization constant or a constant. The current WGSL spec is incorrect in that it says it attaches to an Input variable.

The spec needs to be updated so that WorkgroupSize only attaches to a const vec3<u32>

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