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* Avoid unnecessary operand loads for add/subtract operations where both sources are identical. * Improved code generation for rotate through carry with immediate shift count and/or immediate zero source. -cpu/uml.cpp: Fixed potential assertion failure when a degenerate rotate through carry is converted to a move. -dynax/ddenlovr.cpp: Fixed DIP switch labels and added locations for Mahjong Dai Touyouken and Return of Sel Jan 2. -docs: Documented DRC UML rotate through carry instructions.