Fixed a few m_private_run_lock issues when attaching and also fixed the process to not try to restart the process if the process is exited, crashed or detached. Partial patch from Carlo Kok.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@179738 91177308-0d34-0410-b5e6-96231b3b80d8