[jdk17u] RFR: 8272473: Parsing epoch seconds at a DST transition with a non-UTC parser is wrong

[Chris Hegarty]

8272473: Parsing epoch seconds at a DST transition with a non-UTC parser is wrong

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Commit messages:
 - Backport fe7d70886cc9985478c5810eff0790648a9aae41

Changes: https://git.openjdk.java.net/jdk17u/pull/54/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=54&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272473
  Stats: 14 lines in 2 files changed: 8 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/54.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/54/head:pull/54

PR: https://git.openjdk.java.net/jdk17u/pull/54