For the most part you should be fine, that being said though Ryzen really performs much better when overclocked. If you can get it around 3.8ghz you may (depending on game) see a considerable improvement on your FPS.
Ok, I had to dig a little to work out an acceptable answer on this one. I don't think it will bottleneck the 1080, and if it does it would be minimal. Given how close the performance is to the i5 6600K and 7600K, which are popular pairings with the GTX 1080, I think it would be fine.
For the most part you should be fine, that being said though Ryzen really performs much better when overclocked. If you can get it around 3.8ghz you may (depending on game) see a considerable improvement on your FPS.
At 1080p, the 1500x would bottleneck the 1080ti some. But when you move up in resolution, the bottleneck moves from the CPU to the GPU because the GPU has to work a lot harder. I would not worry about it at all at 1440p or 4k.