If the swift print description puts a newline at the end of the description function, don't add another one.
If the swift print description puts a newline at the end of the description function,
don't add another one.

<rdar://problem/25755431>

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb