[jdk25u] RFR: 8366813: GCC 12 cannot compile SVE on aarch64 with auto-var-init pattern

[Fei Gao]

Backport of https://github.com/openjdk/jdk/commit/999761d0f6d37c9cd6ec482620800b694c5fb9ad

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Commit messages:
 - 8366813: gcc 12 cannot compile SVE on aarch64 with auto-var-init pattern

Changes: https://git.openjdk.org/jdk25u/pull/168/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=168&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366813
  Stats: 11 lines in 1 file changed: 11 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk25u/pull/168.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/168/head:pull/168

PR: https://git.openjdk.org/jdk25u/pull/168