Blender Git Loki

Fix T42621: Glossy world ray visibility affects on transmission rays

There seems to be inconsistency in flags checks in Cycles kernel. In the interface
glossy means "Glossy Reflection" and it is properly taken into account when doing
visibility check in BVH traversal.

The check in indirect background/light emission was treating this flags as "any of
glossy reflection or transmission" which is kind of weird.

Made it so emission code follows ray visibility assumptions in other parts of the
kernel now.