intel/brw: Delete SAD2 and SADA2 opcodes
These were removed with Icelake. While they technically still exist on Skylake, which this compiler supports, we have never used these opcodes in the 14 years we could have done so. So just scrap them.
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These were removed with Icelake. While they technically still exist on Skylake, which this compiler supports, we have never used these opcodes in the 14 years we could have done so. So just scrap them.