Reproduction steps:

1. Add the attached package to any project.
2. Build and run the only scene to iOS.
3. Monitor memory usage for a few minutes.
4. Notice an increase in memory usage(Picture attached).

Note:
- Memory usage increase speed reduces drastically after ~1 minute but still continues.
- 5.3 memory increase graph doesn't have such a long uphill(Picture attached).
- Picture with package content attached.

Reproduced with:
5.3.7p3, 5.4.0f3, 5.6.0b3

Not reproducible with:
OSX Editor
OSX Standalone