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anv: Enable KHR_shader_integer_dot_product

Ian Romanick requested to merge idr/mesa:review/anv-vk_khr_shader_integer_dot_product into main

Open questions:

Should we mark the integerDotProduct8Bit*Accelerated? It's only the 4 element vector cases that get automatically turned into the DP4A instruction.

Should we mark all of the (non-64-bit) AccumulatingSaturating instructions as accelerated? On all platforms? Applications are unlikely to use the "add with saturate" opcodes from VK_INTEL_shader_integer_functions2, so, technically, this would "[provide] a performance advantage over user-provided code composed from elementary instructions..."

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