@Override
	public String toString() {
		return "<Call " + userop.getName() + "(" +
			args.stream().map(a -> a.toString()).collect(Collectors.joining(",")) + ")>";
	}
Build a call expression

@param ctx the context
@param userop the userop to invoke
@param args the arguments to pass in (by reference)
Ghidra/Features/SystemEmulation/src/main/java/ghidra/pcode/struct/CallExpr.java