Intel Mesa Drivers Add Option To Disable Xe3's Variable Register Thread "VRT" Feature

One of the interesting new additions with the upcoming Intel Xe3 integrated and discrete graphics is the Variable Register Thread "VRT" feature. Making use of Variable Register Thread can reduce register splitting, reduce bandwidth consumption, and improve overall performance. More background information on Intel VRT can be found in that aforelinked Phoronix article. But now the ability is coming to optionally disable VRT...