Moving from std::auto_ptr<char> to std::string for simple string memory management.
It is better practice and, also, it is not clear whether std::auto_ptr<> is smart enough to know about delete[] vs. delete

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@174236 91177308-0d34-0410-b5e6-96231b3b80d8