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shader: Use swizzles on return values of (i|u)mulextended

Gert Wollny requested to merge gerddie/virglrenderer:fix-umulextended-swizzles into master

A recent change in the mesa glsl code mesa/e551040c resulted in a regression for

dEQP-GLES31.functional.shaders.builtin_functions. integer.umulextended.uvec*

because the generated TGSI was staring to use only certain components of the temporary return values. Therefore, it became visible that the swizzle was not honored on these values.

Signed-off-by: Gert Wollny gert.wollny@collabora.com

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