@Override
			public boolean evaluateReference(VarnodeContext context, Instruction instr, int pcodeop,
					Address address, int size, DataType dataType, RefType refType) {

				return super.evaluateReference(context, instr, pcodeop, address, size, dataType,
					refType);
			}
Get the register at the location

@param opIndex index into operands for instruction
@param subOpIndex index into operands for an operand location

@return register if there is one at the location
Ghidra/Features/Base/ghidra_scripts/MultiInstructionMemReference.java