[SPIR-V] Implement EvaluateAttribute* functions #6945
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Emits SPIR-V InterpolateAt* instructions from the GLSL.std.450 extended instruction set for EvaluateAttribute*. Relies on the optimizer's copy propagate passes to ensure that these instructions are passed valid pointers in the Input storage class after legalization. Fixes microsoft#3649
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Emits SPIR-V InterpolateAt* instructions from the GLSL.std.450 extended instruction set for EvaluateAttribute*. Relies on the optimizer's copy propagate passes to ensure that these instructions are passed valid pointers in the Input storage class after legalization.
Fixes #3649