[lib][arch] add = operator for t_metadata_value

Author: amin1377

libs/libarchfpga/src/physical_types.h

@@ -97,6 +97,13 @@ class t_metadata_value {
     // Return string value.
     vtr::interned_string as_string() const { return value_; }
 
+    t_metadata_value& operator=(const t_metadata_value& o) noexcept {
+        if (this != &o) {
+            value_ = o.value_;
+        }
+        return *this;
+    }
+
   private:
     vtr::interned_string value_;
 };

libs/libarchfpga/src/read_xml_arch_file.cpp

@@ -891,7 +891,7 @@ static std::pair<int, int> process_pin_string(pugi::xml_node Locations,
     if (port == nullptr) {
         archfpga_throw(loc_data.filename_c_str(), loc_data.line(Locations),
                        vtr::string_fmt("Port %s for %s could not be found: %s\n",
-                                       type->name.c_str(), token.data,
+                                       type->name.c_str(), token.data.c_str(),
                                        pin_loc_string)
                            .c_str());
     }