To reproduce:
1. Open attached project "PostProcessDoFIssue.zip"
2. Open "SampleScene.unity" scene
3. Build for iOS
4. Deploy the Xcode project to iOS device
5. Observe the white artifacts around spiky spheres

Expected result: no white artifacts
Actual result: getting lots of flickering and white artifacts around spheres

Reproduced on:
2019.1.0a10 2019.1.8f1 2019.2.0b8 2019.3.0a8

Not reproduced on:
2018.4.2f1

Package version:
- 2.1.7
- 2.1.0
- 2.0.16 - preview

Device reproduced on:
iPhone X iOS 13.0

Device not reproduced on:
iPhone 8 Plus iOS 12.2
VLNQA00218, Samsung Galaxy Note9 (SM-N960U), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630

Notes:
- Pressing Toggle DOF button on the device in the left top corner disables Depth of Field and stops the flickering
- Errors in 2.0.2 - 2.0.15 package version
- Doesn't reproduce in the Editor
- Getting errors on 2019.1.0a1 - 2019.1.0a9