Use ArrayUtils.unshift() in RubyObjectMessages.invokeMember()

Author: eregon

src/main/java/org/truffleruby/interop/messages/RubyObjectMessages.java

@@ -12,6 +12,7 @@
 import org.truffleruby.Layouts;
 import org.truffleruby.RubyContext;
 import org.truffleruby.RubyLanguage;
+import org.truffleruby.core.array.ArrayUtils;
 import org.truffleruby.core.cast.BooleanCastNode;
 import org.truffleruby.core.cast.IntegerCastNode;
 import org.truffleruby.core.cast.LongCastNode;
@@ -471,9 +472,7 @@ protected static Object invokeMember(DynamicObject receiver, String name, Object
 
         Object[] convertedArguments = foreignToRubyArgumentsNode.executeConvert(arguments);
         Object rubyName = nameToRubyNode.executeConvert(name);
-        Object[] combinedArguments = new Object[convertedArguments.length + 1];
-        combinedArguments[0] = rubyName;
-        System.arraycopy(convertedArguments, 0, combinedArguments, 1, convertedArguments.length);
+        Object[] combinedArguments = ArrayUtils.unshift(convertedArguments, rubyName);
         Object dynamic;
         try {
             dynamic = dispatchDynamic.call(receiver, "polyglot_invoke_member", combinedArguments);