The affected shader seems to be the #22 one, but it's hard to guess what's
wrong with the shader http://pastie.org/private/ccwhydvtgzw0rc1t8xdeoq

As abstract of this dolphin commit, it's basicly a rewrite of our fragment
shaders with integer math, so I doubt it's useful to debug in this direction :/

About this shader, I see two uncommon features: We write to gl_FragDepth and we
use a bitshift with an offset from an integer ubo. Maybe I'm lucky ...

About the issue itself, it only happens on *some* GPUs, so maybe a kind of
shader compilation issue?