Adding a hole to landscape and previewing in OpenGL ES2(Mobile) Crashes UE4

Making a hole in a landscape and viewing in mobile preview using OpenGL ES2(Mobile) and stopping preview crashes editor.

1. Open a new Project in 4.9
2. Create a New Material
3. Change that material to masked
4. Create a Landscape Visibility Mask node
5. Link that to Opacity mask
6. Apply
7. Create a Landscape
8. Create a hole using the Visibility Tool
9. Switch Preview Render to OpenGL ES2(Mobile)
10. Play the game
11. Stop the game
12. Observe Crash

Fix UE-51650

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