RFR: 8344304: [s390x] ubsan: negation of -2147483648 cannot be represented in type 'int'

[Amit Kumar]

fixes the issue reported by ubsan.

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Commit messages:
 - updates instruction

Changes: https://git.openjdk.org/jdk/pull/22456/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22456&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344304
  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22456.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22456/head:pull/22456

PR: https://git.openjdk.org/jdk/pull/22456