Steps to reproduce:
1. Open attached project (TestSharedUIProject)
2. Open scene "HudText.unity" and open profiler
3. Click "profile editor", start recording
4. Play the game
5. Start clicking on the spheres
6. Notice the increasing texture and mesh memory that is not released even when the game is stopped

Expected result: UGUI Text Component should not cause a memory leak

Reproduced in: 2017.2.0b2, 2017.1.0f2, 2017.1.0a1
Not reproduced in: 5.6.2p2, 5.5.4p1
Regression since: 2017.1.0a1