<rdar://problem/13063912>

If the user pressed ^D, that would bypass the exit confirmation mechanism
This checkin remedies that by making sure that users get prompted on exit when appropriate even if they use CTRL+D instead of typing quit at the prompt



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181257 91177308-0d34-0410-b5e6-96231b3b80d8