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svga: fix invalid component access of domain location

Charmaine Lee requested to merge charmainel/mesa:fix-domain-location into staging/22.2

Tesscoord is declared as vec3 in the incoming shader but the z component of a tesscoord should only be referenced in the domain shader if the tessellator domain is of triangle type.

Fixes vmx crash running GFXBench-Tessellation with MTL Renderer.

Reviewed-by: Martin Krastev krastevm@vmware.com Reviewed-by: Min-Yu Huang min-yuhuang@vmware.com (cherry picked from commit f73862d3)

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