RFR: 8343506: [s390x] multiple test failures with ubsan

[Amit Kumar]

This is trivial patch which fixes the error I am seeing on s390x, while running tier1 with ubsan enabled. Please see JBS for more details.

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Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/21864/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21864&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343506
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21864.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21864/head:pull/21864

PR: https://git.openjdk.org/jdk/pull/21864