8371205: AArch64: Remove unused cmpxchg* methods

[ruben-arm]

Since JDK-8364406, the AArch64 macroAssembler method cmpxchg_obj_header is no longer used. The method cmpxchgptr is used by cmpxchg_obj_header however is not used by any other method so can be removed alongside cmpxchgptr.
cmpxchgw is also unused and can be removed.

---

Progress

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Issue

• JDK-8371205: AArch64: Remove unused cmpxchg* methods (Enhancement - P4)

Reviewers

• Andrew Haley (@theRealAph - Reviewer)
• Kim Barrett (@kimbarrett - Reviewer)
• Hao Sun (@shqking - Committer)

Contributors

• Samuel Chee <samche01@arm.com>

Reviewing

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[ruben-arm]

/contributor add @spchee

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[openjdk]

@ruben-arm This change now passes all automated pre-integration checks.

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8371205: AArch64: Remove unused cmpxchg* methods

Co-authored-by: Samuel Chee <samche01@arm.com>
Reviewed-by: aph, kbarrett, haosun

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At the time when this comment was updated there had been 51 new commits pushed to the master branch:

• f6f87bb: 8371133: Clarify the purpose of "src/jdk.compiler/share/classes/com/sun/tools/javac/resources/ct.properties"
• 3e3822a: 8365047: Remove exception handler stub code in C2
• 6a51b51: 8371197: G1: Use void for return type of G1RegionsOnNodes::add
• ... and 48 more: https://git.openjdk.org/jdk/compare/667744c353e4d6abbe5cbf85746e5e0e44dafaf8...master

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[ruben-arm]

/contributor add Samuel Chee samche01@arm.com

[openjdk]

@ruben-arm
Contributor Samuel Chee <samche01@arm.com> successfully added.

[mlbridge]

Webrevs

• 00: Full (d87d9622)

[theRealAph]

Trivial, obviously correct.

[theRealAph]

/reviewers 1

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[kimbarrett]

Looks good.

[openjdk]

@theRealAph
The total number of required reviews for this PR (including the jcheck configuration and the last /reviewers command) is now set to 1 (with at least 1 Reviewer).

[ruben-arm]

/integrate

[openjdk]

@ruben-arm
Your change (at version d87d962) is now ready to be sponsored by a Committer.

[fg1417]

/sponsor

[openjdk]

Going to push as commit c9a9816.
Since your change was applied there have been 51 commits pushed to the master branch:

• f6f87bb: 8371133: Clarify the purpose of "src/jdk.compiler/share/classes/com/sun/tools/javac/resources/ct.properties"
• 3e3822a: 8365047: Remove exception handler stub code in C2
• 6a51b51: 8371197: G1: Use void for return type of G1RegionsOnNodes::add
• ... and 48 more: https://git.openjdk.org/jdk/compare/667744c353e4d6abbe5cbf85746e5e0e44dafaf8...master

Your commit was automatically rebased without conflicts.

[openjdk]

@fg1417 @ruben-arm Pushed as commit c9a9816.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.