adds Modifier#isVarArgs()

src/main/javassist/Modifier.java

@@ -169,6 +169,14 @@ public class Modifier {
         return (mod & STRICT) != 0;
     }
 
+    /**
+     * Returns true if the modifiers include the <tt>varargs</tt>
+     * (variable number of arguments) modifier.
+     */
+    public static boolean isVarArgs(int mod)  {
+        return (mod & VARARGS) != 0;
+    }
+
     /**
      * Truns the public bit on.  The protected and private bits are
      * cleared.

src/test/javassist/JvstTest5.java

@@ -393,4 +393,10 @@ public class JvstTest5 extends JvstTestRoot {
     private InnerClassesAttribute getInnerClassAttr(CtClass cc) {
         return (InnerClassesAttribute)cc.getClassFile2().getAttribute(InnerClassesAttribute.tag);
     }
+
+    public void testVarArgsModifier() throws Exception {
+        CtClass cc = sloader.get("test5.VarArgsMethod");
+        assertTrue(Modifier.isVarArgs(cc.getDeclaredMethod("foo").getModifiers()));
+        assertFalse(Modifier.isVarArgs(cc.getDeclaredMethod("bar").getModifiers()));
+    }
 }