RFR: 8269685: Optimize HeapHprofBinWriter implementation [v4]

[Lin Zang]

On Fri, 13 Aug 2021 10:46:02 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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - Merge branch 'master' into hprof
>  - fix write size issue
>  - Merge branch 'master' into hprof
>  - 8269685: Optimize HeapHprofBinWriter implementation

Added the tests I have conducted:
    Passed test tier1 (tier2 and tier3 not executed)
    Tested to dump netbeans with heap size at ~500MB, ~700MB and 1GB, and tested w/o -gz option from 1-9. all passed.
    A workload that generate different object to fill heap, I have tested with heap usage from 1GB to 4GB with different gz options. All passed.

-------------

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