RFR: 8269685: Optimize HeapHprofBinWriter implementation [v5]

[Lin Zang]

On Tue, 24 Aug 2021 07:12:51 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> This PR rewrite the implementation of the HeapHprofBinWriter, which could simplify the logic of current implementation.
>> please see detail description at https://bugs.openjdk.java.net/browse/JDK-8269685.
>
> Lin Zang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   code clean up and remove useless methods

Hi Serguei, 
    I update the PR to make the `calculateGlobalJNIHandlesDumpRecordSize()` method abstract. 
    For other empty ones that already there in original implementation, I will leave them as they are. do you think it is OK? 

BRs,
Lin

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PR: https://git.openjdk.java.net/jdk/pull/4666