[jdk11u-dev] RFR: 8268361: Fix the infinite loop in next_line [v2]

[Jan Kratochvil]

> There was a backport of the JDK-18 fix to JDK-13, JDK-15 and JDK-17.
> 
> **Issues**
> 
> - [JDK-8268361](https://bugs.openjdk.org/browse/JDK-8268361): Fix the infinite loop in next_line
> 
> I am not yet an Author - I do not have JBS account.
> 
> I have run the testsuite on linux64 and there is no change of the results. There is no new testcase for this fix and I did not do any extra testing of the fix.

Jan Kratochvil has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8268361: Fix the infinite loop in next_line
  
  Backport-of: 72672277e4dddf8e72f1c705cd5f57de40745635

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1508/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1508/files/9ca71d41..11f4f6b0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1508&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1508&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1508.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1508/head:pull/1508

PR: https://git.openjdk.org/jdk11u-dev/pull/1508