private DataType removeTypeDefs(DataType dt) {
		if (dt instanceof TypeDef) {
			return ((TypeDef) dt).getBaseDataType();
		}
		return dt;
	}
Markup scalar with implied register variable reference if one can be
determined.

@param instr instruction
@param func function containing instruction
@param scalarToReplace
@param scalarIndex index of scalarToReplace within representationList
@param associatedRegister register associated with scalarToReplace via an
           INT_ADD operation
@param representationList
Ghidra/Features/Base/src/main/java/ghidra/program/model/listing/CodeUnitFormat.java