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vkd3d-shader/hlsl: Implement sincos.

Petrichor Park requested to merge petrathekat/vkd3d:impl-sincos into master

Another intrinsic we are missing.

I implemented this as just doing a sin and cos operation. Flattening this to one sincos opcode should probably be done in our folding/optimization steps and is probably orthogonal to this MR.

Native behavior does not return very precise results, which is why the ulps are so big on the tests.

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