To reproduce:
1. Clone this repo: https://github.com/cinight/GraphicsPerf or use project attached by QA
2. Switch platform to iOS
3. Build and run Particles Collision scene on iOS device
4. Inspect memory usage in debug window in Xcode
5. Compare results between 2018.2 and 2019.1 versions

Expected result: No spikes in memory usage, memory usage shouldn't increase in newer version
Actual result: Spike on app launch

Devices: iPhone XS iOS 12.0, iPhone 6s iOS 11.2.1, iPhone SE iOS 11.4.1
On iPhone SE and iPhone 6s app usually crashes with newer version.

Tested versions: Unity 2018.2.1f1 vs Unity 2019.1.0a14