Fix corrupted args for io.lines and file:lines on reuse stack elements.

src/core/org/luaj/vm2/Varargs.java

@@ -707,8 +707,10 @@ public abstract class Varargs {
 	/** Return Varargs that cannot be using a shared array for the storage, and is flattened.
 	 * Internal utility method not intended to be called directly from user code.
 	 * @return Varargs containing same values, but flattened and with a new array if needed.
+	 * @exclude
+	 * @hide
 	 */
-	Varargs dealias() {
+	public Varargs dealias() {
 		int n = narg();
 		switch (n) {
 		case 0: return LuaValue.NONE;

src/core/org/luaj/vm2/lib/IoLib.java

@@ -290,7 +290,7 @@ public class IoLib extends TwoArgFunction {
 		public IoLibV(File f, String name, int opcode, IoLib iolib, boolean toclose, Varargs args) {
 			this(f, name, opcode, iolib);
 			this.toclose = toclose;
-			this.args = args;
+			this.args = args.dealias();
 		}
 		public IoLibV(File f, String name, int opcode, IoLib iolib) {
 			super();