[jdk21u-dev] RFR: 8321308: AArch64: Fix matching predication for cbz/cbnz

[Boris Ulasevich]

Clean backport to improve aarch code generation for array length `if (a.length > 0)`

Testing: jtreg tier1-3 on linux-aarch64.

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Commit messages:
 - Backport 2c9185eb81c9dfcc30d160a6254089c474b56b0d

Changes: https://git.openjdk.org/jdk21u-dev/pull/940/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=940&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321308
  Stats: 131 lines in 3 files changed: 116 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/940.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/940/head:pull/940

PR: https://git.openjdk.org/jdk21u-dev/pull/940