RFR: 8261482: Adjust jmap histo command to accept noparallel option to inspect heap serially

[Lin Zang]

On Thu, 11 Feb 2021 02:43:46 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> 8261482: Adjust jmap histo command to accept noparallel option to inspect heap serially
>
> Dear All,
>      Stories and discussions related with this PR could be found at #2379 and #2261.  Just FYI.
> BRs,
> Lin

>From the discussion of #2379, it is prefered to keep "parallel=n" option. 
so close this PR.

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PR: https://git.openjdk.java.net/jdk/pull/2519