RFR: 8262329: Fix JFR parser exception messages [v2]

[Jie Kang]

On Thu, 25 Feb 2021 20:15:48 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> > I'm not sure why there is a check for chunk header? I think the check can be removed, including the static field.
> 
> I am not sure either. From what I can glean from the log message, the intention is to print some information when a constant pool is never used, except for the ChunkHeader.

I think the intention is to log a pool that's never used. Wouldn't that make sense for the ChunkHeader checkpoint that was introduced with event streaming? Is it used elsewhere?

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PR: https://git.openjdk.java.net/jdk/pull/2714