Lengthy Compile Times on Blueprints Containing an Array of Self References When Multiple Instances Exist in the Level

There are lengthy compile times with a blueprint with 50+ instances in the level that contains an array of self references. On lower-end machines, the compile times are upwards of 10 seconds.

Found in 4.13.1. Reproduced in 4.14 Main CL 3156733 and 4.12.5.

1. Open the editor
2. Create a new actor blueprint
3. Add a new Array variable of "ActorName" references.
4. Place 50+ instances of the actor in the scene
5. Attempt to compile the actor blueprint

Result: Notice a lengthy compile time. On my machine it was around 3 seconds, on the user's lower end machine it was reported as 10 seconds.

Expected: An average compile time of a second at most.

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