Fix a crash in *NetBSD::Factory::Launch

Summary:
We cannot call process_up->SetState() inside
the NativeProcessNetBSD::Factory::Launch
function because it triggers a NULL pointer
deference.

The generic code for launching a process in:
GDBRemoteCommunicationServerLLGS::LaunchProcess
sets the m_debugged_process_up pointer after
a successful call to  m_process_factory.Launch().
If we attempt to call process_up->SetState()
inside a platform specific Launch function we
end up dereferencing a NULL pointer in
NativeProcessProtocol::GetCurrentThreadID().

Use the proper call process_up->SetState(,false)
that sets notify_delegates to false.

Sponsored by <The NetBSD Foundation>

Reviewers: labath, joerg

Reviewed By: labath

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D42868

llvm-svn: 324234