RFR: 8258593: remove redundant codes in HeapObjectDumper

[Lin Zang]

On Thu, 17 Dec 2020 15:37:09 GMT, Lois Foltan <lfoltan at openjdk.org> wrote:

>> 8258593: remove redundant codes in HeapObjectDumper
>
> LGTM.
> Lois

Dear all, 
    May I ask your help to sponsor this pr? 
    P.S. the failed case on linux x86_32 seems not relate to this change, it is tracked on another issue JDK-8258584.
    Thanks!
-Lin

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PR: https://git.openjdk.java.net/jdk/pull/1819