If HandleCommands is called with add_to_history set to false, turn on the m_command_source_depth so that when we forget the value for regex & alias commands it still stays off.

<rdar://problem/13795202>

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@180971 91177308-0d34-0410-b5e6-96231b3b80d8