Blender Git Loki

Fix T58142: Crash when use Cycles to render stereoscopy

This is a quick workaround to prevent the crashes with multi-view.
The ultimate solution can be plenty, and would turn around refactoring
Cycles to handle multi-view internally, so that depsgraph could be freed
before render with no problems.

Reviewers: brecht, sergey

For the complete discussion check: https://developer.blender.org/D4239