Delete move constructor from TaggedStringStream (pytorch#28604)

Summary:
Pull Request resolved: pytorch#28604

This isn't used anywhere, and it doesn't work with older libstdc++
because std::ostringstream is not copyable or movable.

Test Plan: Internal android build.

Reviewed By: jamesr66a

Differential Revision: D18099511

fbshipit-source-id: 1ffb49303aa5d7890ca7f057b21886f88c04ce20

torch/csrc/jit/passes/python_print.cpp

@@ -106,7 +106,6 @@ struct PythonPrintImpl {
   class TaggedStringStream {
    public:
     TaggedStringStream(const SourceRangeStack* srs) : srs_(srs) {}
-    TaggedStringStream(TaggedStringStream&& rhs) = default;
 
     TaggedStringStream& operator<<(const std::string& s) {
       // This prevents having redundant entries at the same offset,