Purpose of old com.google.gwt.dev.asm package

Hi

What is the purpose of classes from 'com.google.gwt.dev.asm' package and classes that were available till 2.6.1. I believe they were required for plugin but not required after SuperDev. Is that correct understanding? If not what is the alternative in 2.8.2  for this?

Thanks,
-Hrishikesh

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