search for: nvc0_shader_stag

Backtrace: ... 0x00007ffff57fc392 in __assert_fail () from /lib64/libc.so.6 0x00007ffff0cf5bec in nvc0_shader_stage (pipe=<optimized out>) at ./nvc0/nvc0_context.h:204 nvc0_set_constant_buffer (pipe=0x631080, shader=<optimized out>, index=<optimized out>, cb=0x0) at nvc0/nvc0_state.c:771 0x00007ffff0a2cf63 in st_destroy_context (st=0x68a9f0) at state_tracker/st_context.c:382 ... Signed-off-...

This is enough to enable tessellation support on nvc0. It seems to work a lot better on my GF108 than GK208. I suspect that there's some sort of scheduling shenanigans that need to be adjusted for kepler+. Or perhaps some shader header things. Even with the GF108, I still get occasional blue triangles in Heaven, but I get a *ton* of them on the GK208 -- seemingly the same issue, but it's