How to reproduce:
1. Create a new empty project
2. Build and run on device which runs iOS 7
Result: crash

When project runs using Metal graphics API crash "dyld: Symbol not found: _kCVPixelBufferMetalCompatibilityKey"
When project runs using OpenGL graphics API crash "dyld: Symbol not found: _OBJC_CLASS_$_UIAlertAction"

Reproducible: 2018.1.0b1
Not reproducible: 2018.1.0a7

DUT(reproducible):
iPad Mini iOS 7.0.2
iPad Mini 2 iOS 7.1.2

DUT(not reproducible):
iPad Air iOS 8.1.1
iPad Mini iOS 9.3.5
iPad Pro 10.5 iOS 10.3.3
iPhone 8 iOS 11.0

Won't fix: We no longer support iOS 7 in 2018.1