Fix PlaygroundTransform/placeholder.swift for iOS sim
Fix PlaygroundTransform/placeholder.swift for iOS sim

Only assert that the crash case fails rather than that it crashes or
doesn't crash, since simctl hides whether its child process crashed on
the iOS Simulator environment.

<rdar://problem/23884764>

khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift