Crash while turning off occlusion culling with high shadow distance. It happens only with specific camera positions and models.

Reproduction steps:

1. Open attached project
2. Open Design_TestsA scene
3. In quality settings, make sure that shadow distance is high enough (10000)
4. Select camera object
5. Turn on Occlusion window
6. Untick the "Occlusion culling" checkbox from the scene debug visualisation in frame tool.
7. Observe the bug. Unity crashes

What should happen: occlusion culling is turned off.
What happens: Unity crashes.

Didn't reproduce on: 5.6.0a1, 5.6.0a2, 5.6.0a3, 5.6.0a4, 5.6.0a5
Reproduced on: 5.6.0a6, 5.6.0b1, 5.6.0b9, 5.6.0b11, 2017.1.0a3

Fixed in: 2017.1.0b5
Backported to: 5.6.1p1