Steps to reproduce:

1. Create new project, choose 'Lightweight RP (Preview)' as a template
2. Switch to iOS
3. Build 'samplescene' for iOS and deploy to iOS 8 device
4. Notice the build crashes at the start with the following stacktrace (player log attached as ipadair2.log):

* thread #31, name = 'UnityGfxDeviceWorker', stop reason = signal SIGABRT
frame #0: 0x000000019883b270 libsystem_kernel.dylib`__pthread_kill + 8
frame #1: 0x00000001988d9228 libsystem_pthread.dylib`pthread_kill + 112
frame #2: 0x00000001987b2b18 libsystem_c.dylib`abort + 112
frame #3: 0x0000000197885418 libc++abi.dylib`abort_message + 116
frame #4: 0x00000001978a4b8c libc++abi.dylib`default_terminate_handler() + 304
frame #5: 0x00000001980b43c0 libobjc.A.dylib`_objc_terminate() + 128
frame #6: 0x00000001978a1bb4 libc++abi.dylib`std::__terminate(void (*)()) + 16
frame #7: 0x00000001978a1478 libc++abi.dylib`__cxa_throw + 136
frame #8: 0x00000001980b4204 libobjc.A.dylib`objc_exception_throw + 348
frame #9: 0x00000001875ccf14 CoreFoundation`-[NSObject(NSObject) doesNotRecognizeSelector:] + 220
frame #10: 0x00000001875c9cc4 CoreFoundation`___forwarding___ + 928
frame #11: 0x00000001874cec1c CoreFoundation`_CF_forwarding_prep_0 + 92
* frame #12: 0x00000001007b77b0 ProductName`::CreateComputeProgram() at GfxDeviceMetal.mm:3029 [opt]
frame #13: 0x0000000100b6d6d0 ProductName`::RunCommand() at GfxDeviceWorker.cpp:1563 [opt]
frame #14: 0x00000001007b8a18 ProductName`::GfxDeviceWorkerAutoreleasePoolProxy() at GfxDeviceMetal.mm:3549 [opt]
frame #15: 0x0000000100b6dc8c ProductName`::RunExt() [inlined] ProcessGfxCommands at GfxDeviceWorker.cpp:151 [opt]
frame #16: 0x0000000100b6dc20 ProductName`::RunExt() at GfxDeviceWorker.cpp:415 [opt]
frame #17: 0x0000000100b65f10 ProductName`::RunGfxDeviceWorker() at GfxDeviceWorker.cpp:378 [opt]
frame #18: 0x0000000100994340 ProductName`::RunThreadWrapper() at Thread.cpp:42 [opt]
frame #19: 0x00000001988d7e80 libsystem_pthread.dylib`_pthread_body + 164
frame #20: 0x00000001988d7ddc libsystem_pthread.dylib`_pthread_start + 160
frame #21: 0x00000001988d4fb0 libsystem_pthread.dylib`thread_start + 4

Reproduced with: 2018.1.0f1, 2018.2.0b1

Devices:
iPad Air 2, iOS 8 - Reproduced
iPhone 6 Plus, iOS 8 - Reproduced
iPhone 6, iOS 10 - Not reproduced
iPhone 7 Plus, iOS 11 - Not reproduced