8373021: aarch64: MacroAssembler::arrays_equals reads out of bounds

[shipilev]

Fixes the AArch64 bug with +UCOH.

Additional testing:

• Linux AArch64 server fastdebug, all

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8373021 needs maintainer approval

Issue

• JDK-8373021: aarch64: MacroAssembler::arrays_equals reads out of bounds (Bug - P3 - Requested)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/239/head:pull/239
$ git checkout pull/239

Update a local copy of the PR:
$ git checkout pull/239
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/239/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 239

View PR using the GUI difftool:
$ git pr show -t 239

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/239.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[shipilev]

/approval request Fixes the AArch64 bug with +UCOH. The patch is relatively new, only a few weeks old, but it is simple and has no bugtail. We have seen this crash in the wild, so there is user exposure. Applies cleanly. All tests pass.

[openjdk]

⚠️ @shipilev This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[openjdk]

@shipilev
8373021: The approval request has been created successfully.

[mlbridge]

Webrevs

• 00: Full (9286cf81)