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d3d12: Only evaluate provoking vertex if we already have a vertex stage

Gert Wollny requested to merge gerddie/mesa:d3d12_fix_provokin_vertex_key_eval into msclc-d3d12

Shaders can be passed to the driver in any order and currently we have to compile also the initial variant, which means that we may get a fragment shader without the final vertex stage already set. Hence we can't evaluate the shader key for the provoking vertex yet.

Closes #85

@billkris.ms This should fix the crash

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