Added addPush version taking long argument.

js/rhino/src/org/mozilla/classfile/ClassFileWriter.java

@@ -821,6 +821,22 @@ public class ClassFileWriter {
         }
     }
 
+    /**
+     * Generate code to load the given long on stack.
+     *
+     * @param k the constant
+     */
+    public void addPush(long k)
+    {
+        int ik = (int)k;
+        if (ik == k) {
+            addPush(ik);
+            add(ByteCode.I2L);
+        } else {
+            addLoadConstant(k);
+        }
+    }
+
     /**
      * Generate code to load the given double on stack.
      *