<rdar://problem/13880690>

Lock the lldb_private::Module mutex while tearing down the module to make sure we don't get clients accessing the contents on a module as it is going away.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@182511 91177308-0d34-0410-b5e6-96231b3b80d8