Blender Git Loki

Cycles / Branched Path: Some simplifications for main loop.

The main loop only handles transparent intersections from the camera ray.
Therefore we can simplify some things.

* Avoid PATH_RAY_CAMERA check, this is always true.
* Avoid path_state_next() call, we can just set transparent flag and increase transparent bounces. This way we avoid the function call and some branching.

Also remove debug num_ray_bounces++, this is incorrect here as no indirect bounce happens here.

Should be no functional changes.