public ExprTree createOpOutUnary(Location location, VarnodeTpl outvn, OpCode opc, ExprTree vn) {
		entry("createOpOutUnary", location, outvn, opc, vn);
		OpTpl op = new OpTpl(location, opc);
		op.addInput(vn.outvn);
		op.setOutput(outvn);
		vn.ops.push_back(op);
		vn.outvn = new VarnodeTpl(location, outvn);
		return vn;
	}
Handle a sleigh 'macro' invocation, returning the resulting p-code op templates (OpTpl)

@param location is the file/line where the macro is invoked
@param sym MacroSymbol is the macro symbol
@param param is the parsed list of operand expressions
@return a list of p-code op templates
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcodeCPort/slgh_compile/PcodeCompile.java