Remove unimplemented function

[aprantl]

Summary

Looks like this was an unintended sideeffect of r124250.

[davide]

LGTM

source/Symbol/Type.cpp

Type::Type(const Type &rhs)
     : std::enable_shared_from_this<Type>(rhs), UserID(rhs), m_name(rhs.m_name),
       m_symbol_file(rhs.m_symbol_file), m_context(rhs.m_context),
       m_encoding_type(rhs.m_encoding_type), m_encoding_uid(rhs.m_encoding_uid),
       m_encoding_uid_type(rhs.m_encoding_uid_type),
       m_byte_size(rhs.m_byte_size),
       m_byte_size_has_value(rhs.m_byte_size_has_value), m_decl(rhs.m_decl),
       m_compiler_type(rhs.m_compiler_type), m_flags(rhs.m_flags) {}
 
-const Type &Type::operator=(const Type &rhs) {
-  if (this != &rhs) {
-  }
-  return *this;
-}
-
 void Type::GetDescription(Stream *s, lldb::DescriptionLevel level,
                           bool show_name) {
   *s << "id = " << (const UserID &)*this;
 
   // Call the name accessor to make sure we resolve the type name
   if (show_name) {
     const ConstString &type_name = GetName();
     if (type_name) {