We're finally getting alpha-to-coverage according to this code review

https://developer.blender.org/D1354

Can’t tell you how psyched I am for this. We can finally get performant anti-aliasing on layered hair and foliage without sorting issues. Of course, it’s not a perfect solution as there are artifacts and multisampling, but I’d say it’s a reasonable trade-off. Also, if I’m not mistaken, this should be able to work with alpha shadows.