8268361: Fix the infinite loop in next_line

[wkia]

Backport of JDK-8268361 to 13u.
It needs to be ported due to similar problems as 17u has.
Fix applies cleanly. Tests tier1 passed after the fix without regression.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8268361: Fix the infinite loop in next_line

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk13u-dev pull/397/head:pull/397
$ git checkout pull/397

Update a local copy of the PR:
$ git checkout pull/397
$ git pull https://git.openjdk.org/jdk13u-dev pull/397/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 397

View PR using the GUI difftool:
$ git pr show -t 397

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk13u-dev/pull/397.diff

[bridgekeeper]

👋 Welcome back wkia! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

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

[openjdk]

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

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

8268361: Fix the infinite loop in next_line

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

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[mlbridge]

Webrevs

• 00: Full (ca7da93b)

[wkia]

/integrate

[openjdk]

@wkia
Your change (at version ca7da93) is now ready to be sponsored by a Committer.

[yan-too]

/sponsor

[openjdk]

Going to push as commit 97c75f0.

[openjdk]

@yan-too @wkia Pushed as commit 97c75f0.

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