How to reproduce:
1. Open attached project
2. Open SampleScene
3. Select GameObject Cube
4. Notice a performance drop in the Scene View
5. Verify the framerate drop in the Profiler when the handle functions are being called using Editor and Deep Profiling

Reproducible with: 2019.1.0b4, 2019.1.8f1, 2019.2.0b8, 2019.3.0a7
Not reproducible with: 2017.4.29f1, 2018.4.3f1, 2019.1.0b3

Expected: The Handles.Disc function should have similar performance to other handles functions.
Actual: The Disc function is more than 15x slower