public void appendOp(Location location, OpCode opc, ExprTree res, long constval, int constsz) {
		entry("appendOp", location, opc, res, constval, constsz);
		OpTpl op = new OpTpl(location, opc);
		VarnodeTpl constvn = new VarnodeTpl(location, new ConstTpl(getConstantSpace()),
			new ConstTpl(ConstTpl.const_type.real, constval),
			new ConstTpl(ConstTpl.const_type.real, constsz));
		VarnodeTpl outvn = buildTemporary(location);
		op.addInput(res.outvn);
		op.addInput(constvn);
		op.setOutput(outvn);
		res.ops.push_back(op);
		res.outvn = new VarnodeTpl(location, outvn);
	}
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