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

[Erik Gahlin]

On Thu, 25 Feb 2021 11:04:13 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> I've been irritated by unreasonable large constant pool offsets in ChunkParser excepion messages. It turns out that lastCP + size concatenates the two numbers as strings instead of adding them.
>> 
>> Testing:
>>  - [x] manually inspecting the exception messages
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Correctly compare strings

I'm not sure why there is a check for chunk header? I think the check can be removed, including the static field.

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Marked as reviewed by egahlin (Reviewer).

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