Added the ability to launch the program that was specified on the command line and have it waiting for a NativeProcessProtocol to attach.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@195370 91177308-0d34-0410-b5e6-96231b3b80d8
Exit if launch doesn't succeed.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@195371 91177308-0d34-0410-b5e6-96231b3b80d8