RFR: 8344304: [s390x] ubsan: negation of -2147483648 cannot be represented in type 'int' [v5]

[Amit Kumar]

> fixes the issue reported by ubsan.

Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:

  make similar to add2reg

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22456/files
  - new: https://git.openjdk.org/jdk/pull/22456/files/608cec70..56a01717

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22456&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22456&range=03-04

  Stats: 43 lines in 3 files changed: 37 ins; 0 del; 6 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