[jdk25u] RFR: 8365312: GCC 12 cannot compile SVE on aarch64 with auto-var-init pattern [v2]

[Fei Gao]

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

Fei Gao has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into backport-switch-pattern-to-zero
 - 8366813: gcc 12 cannot compile SVE on aarch64 with auto-var-init pattern
   
   Backport of https://github.com/openjdk/jdk/commit/999761d0f6d37c9cd6ec482620800b694c5fb9ad

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

Changes:
  - all: https://git.openjdk.org/jdk25u/pull/168/files
  - new: https://git.openjdk.org/jdk25u/pull/168/files/97616cc0..374861cc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk25u&pr=168&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk25u&pr=168&range=00-01

  Stats: 1186 lines in 63 files changed: 566 ins; 125 del; 495 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