improve occupancy for cuda rngs #5710
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Currentlty max 64 blocks of 256 threads are launched, which is very low occupancy and performance on Pascal and Maxwell cards. This PR increases the number of blocks to 200, current max that MTGP can handle without generating additional starting parameter sets. Longer term, core THC should probably be moving to philox (distributions are already using it) and aim for 100% occupancy.