RFR: 8279485: Incorrect copyright year in compiler/lib/ir_framework/IRNode.java after JDK-8278114

[Hao Sun]

On Wed, 5 Jan 2022 04:00:31 GMT, Zhiqiang Zang <duke at openjdk.java.net> wrote:

> > > Didn't know about the rules about copyright years. Should we also make the same fix for https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/mulnode.cpp?
> > 
> > 
> > Is there anything wrong with that file? Or how would you like to fix it?
> 
> I replaced 2021 with 2022 in #6675. I was wondering if we should do 2021, 2022 as well.

No need I think.
Per my understanding, `AA, BB` means this file was created in AA year, and lastly updated in BB year. If `AA == BB`, simply use `AA`.

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PR: https://git.openjdk.java.net/jdk/pull/6962