RFR: 8344304: [s390x] ubsan: negation of -2147483648 cannot be represented in type 'int' [v4]

[Amit Kumar]

> fixes the issue reported by ubsan.

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

  move logic to add2reg_32 & use java_negate()

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22456/files
  - new: https://git.openjdk.org/jdk/pull/22456/files/bc70f092..608cec70

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22456&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22456&range=02-03

  Stats: 24 lines in 3 files changed: 13 ins; 8 del; 3 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