How to reproduce:
1. Open the attached 'SDGPUHang.zip' project
2. Make sure that Metal Editor Support and Metal API Validation are on in Project Settings
3. Build for iOS and open the Xcode project
4. Deploy Xcode project to an iOS device

Expected result: Project builds successfully
Actual result: GPU crash on launch with Xcode error is thrown to the console: 'Execution of the command buffer was aborted due to an error during execution. Caused GPU Hang Error (IOAF code 3)' or 'Execution of the command buffer was aborted due to an error during execution. Invalid Resource (IOAF code 9)'

Reproducible with: 2018.4.26f1, 2019.4.4f1, 2020.1.0b12
Not reproducible with: 2020.1.0b13, 2020.1.0b16, 2020.2.0a18

Reproducible with:
iPhone 8+ (iOS 12.0)
iPhone XR (iOS 13.4.1)
iPad Air 2 (iOS 11.0.3)
iPad 9.7 6th gen (iOS 12.1)

Notes:
- When Metal API Validation and GPU Frame Capture are enabled, error is thrown to the Xcode console: 'validateFunctionArguments:3469: failed assertion `Vertex Function(xlatMtlMain): missing buffer binding at index 2 for UnityInstancing_PerDraw0[0].''
- When testing Open GL, warnings are thrown to the Xcode console: 'ERROR: Shader SimplestInstancedShader shader is not supported on this GPU (none of subshaders/fallbacks are suitable)'
- When entering Play Mode errors are thrown to the console: 'Metal: constant buffer state is invalid'
- Testing on Mac Standalone, the application just displays a black screen, warning in player.log: 'WARNING: RGB Compressed BC6H UFloat format is not supported, decompressing texture', 'Vertex shader missing buffer binding at index 2'