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

[linzang]

---

Progress

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Integration blocker

 ⚠️ The change requires a CSR request to be approved.

Issue

• JDK-8261482: Adjust jmap histo command to accept noparallel option to inspect heap serially

Download

$ git fetch https://git.openjdk.java.net/jdk pull/2519/head:pull/2519
$ git checkout pull/2519

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[openjdk]

@linzang The following labels will be automatically applied to this pull request:

• core-libs
• hotspot-runtime
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[linzang]

/csr needed

[openjdk]

@linzang this pull request will not be integrated until the CSR request JDK-8261543 for issue JDK-8261482 has been approved.

[mlbridge]

Webrevs

• 00: Full (7136441)

[linzang]

Dear All,
Stories and discussions related with this PR could be found at #2379 and #2261. Just FYI.
BRs,
Lin

[AlanBateman]

/label remove core-libs

[openjdk]

@AlanBateman
The core-libs label was successfully removed.

[linzang]

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