To reproduce:
1. Open project attached by QA or create a new project with LWRP template
2. Switch to iOS platform and make sure that Metal API with Linear color space is selected
3. Build and run SampleScene on iOS device

Expected result: Project starts successfully
Actual: Project doesn't start, errors are being spammed to the console.

Error: Execution of the command buffer was aborted due to an error during execution. Ignored (for causing prior/excessive GPU errors) (IOAF code 4)

Reproduced with Unity: 2019.1.0a8, 2019.1.0a6, 2018.3.0b10
Reproduced with LWRP Packages: 4.1.0, 5.0.0, 5.1.0
iOS Devices: iPad Pro 10.5" (MQDT2HC/A) iOS 11.3 (15E216)

Not reproducible with: iPhone X (MQAC2ET/A) iOS 12.1 (16B92), iPad 5th gen 5 (MP2F2HC/A) iOS 10.3.3 (14G60), iPhone Xs (MT9F2ET/A) 12.1 (16B5089b)
Not reproducible with: Unity 2018.3.0b4, 2019.1.0a1

Wasn't able to test with 2019.1.0a5 because of Linker problems.