mesa: make the arguments in the asm statemants optional

geometry shaders emit/end functions don't take any arguments

src/mesa/state_tracker/st_program.c

@@ -489,7 +489,6 @@ st_translate_geometry_program(struct st_context *st,
       return;
    }
 
-   assert(0);
    /* which vertex output goes to the first geometry input */
    if (inputsRead & GEOM_BIT_VERTICES)
       vslot = 0;