[jdk21u-dev] RFR: 8319818: Address GCC 13.2.0 warnings (stringop-overflow and dangling-pointer)

[Aleksey Shipilev]

This batch of fixes improves the warnings handling for newer GCCs. These issues are a bit interdependent contextually, so I opted to pick them up in one batch, making it abundantly clear what are we adding.

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

Commit messages:
 - Backport 97aca09e586c086f8130b394682f45724f08b3a4
 - Backport a1e7a302c8a3d7a1069659653042476b20becabe
 - Backport c0507af5a4d867940b3aee1ac0fc8188b5536825

Changes: https://git.openjdk.org/jdk21u-dev/pull/797/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=797&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319818
  Stats: 30 lines in 3 files changed: 17 ins; 10 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/797.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/797/head:pull/797

PR: https://git.openjdk.org/jdk21u-dev/pull/797