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spirv: Create PRIMITIVE_INDICES for NV_mesh_shader on-demand.

Timur Kristóf requested to merge Venemo/mesa:spirv-add-nv-mesh-output-on-demand into main

The shader can have SpvOpWritePackedPrimitiveIndices4x8NV while the output variable may not exist. This seems to be a defect in the NV_mesh_shader SPIR-V spec, let's work around it by creating the variable on-demand.

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