[jdk26u] RFR: 8373021: aarch64: MacroAssembler::arrays_equals reads out of bounds

[Aleksey Shipilev]

Fixes the +UCOH regression.

Additional testing:
 - [x] GHA

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Commit messages:
 - Backport 2c3ad0f425c75332412a5e8e5733dd0d073a09c8

Changes: https://git.openjdk.org/jdk26u/pull/40/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk26u&pr=40&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373021
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk26u/pull/40.diff
  Fetch: git fetch https://git.openjdk.org/jdk26u.git pull/40/head:pull/40

PR: https://git.openjdk.org/jdk26u/pull/40