Blender Git Loki

Fix T38824: curve which is constrained on a hidden layer causes cycles crash

Issue was caused by cycles setting scene frame which will update scene for
all the layers (not just visible ones) which confuses depsgraph making
objects which are needed as dependency are not really evaluated.

Made it so setting frame via scene.frame_set() which check whether update
need to be flushed to an invisible objects and do this if so.

Not ideal solution but seems to be safest at this point.