bug fixed for multi-version different classloader error. for issue 616.

#616

src/main/java/com/alibaba/fastjson/serializer/ASMSerializerFactory.java

@@ -33,7 +33,7 @@
 
 public class ASMSerializerFactory implements Opcodes {
 
- protected final ASMClassLoader classLoader = new ASMClassLoader();
+ protected final ASMClassLoader classLoader = new ASMClassLoader(ASMSerializerFactory.class.getClassLoader());
 
  private final AtomicLong seed = new AtomicLong();