8255992: JFR EventWriter does not use first string from StringPool with id 0

[kvergizova]

I'd like to backport JDK-8255992 to 15u as a prerequisite for JDK-8257621 and for parity with 11u.
The patch applies cleanly.
Tested with tier1 and jdk/jfr tests, the only failure is jdk/jfr/api/recording/event/TestReEnableName.java, that will be fixed by follow-up backport of JDK-8257621.

---

Progress

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Issue

• JDK-8255992: JFR EventWriter does not use first string from StringPool with id 0

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk15u-dev pull/68/head:pull/68
$ git checkout pull/68

Update a local copy of the PR:
$ git checkout pull/68
$ git pull https://git.openjdk.java.net/jdk15u-dev pull/68/head

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Checkout this PR locally:
$ git pr checkout 68

View PR using the GUI difftool:
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Download this PR as a diff file:
https://git.openjdk.java.net/jdk15u-dev/pull/68.diff

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@kvergizova This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8255992: JFR EventWriter does not use first string from StringPool with id 0

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Webrevs

• 00: Full (2a017df9)

[kvergizova]

/integrate

[openjdk]

@kvergizova Pushed as commit f77ca30.

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