RFR: 8360936: Test compiler/onSpinWait/TestOnSpinWaitAArch64.java fails after JDK-8359435 [v6]

[Evgeny Astigeevich]

On Wed, 9 Jul 2025 13:24:59 GMT, Evgeny Astigeevich <eastigeevich at openjdk.org> wrote:

>> Test compiler/onSpinWait/TestOnSpinWaitAArch64.java needs debug info to identify a position of spin wait instructions in generated code. The test switched to use `XX:CompileCommand=print` instead of `XX:+PrintAssembly` to have assembly only for a tested Java method. In release builds  `XX:+PrintAssembly` prints out debug info but `XX:CompileCommand=print` does not.
>> 
>> This PR reimplements the test to parse instructions and to check them. The test does not rely on debug info anymore.
>> 
>> Tested on Linux and MacOS with and without hsdis:
>> - Fastdebug: test passed
>> - Slowdebug: test passed.
>> - Release: test passed.
>
> Evgeny Astigeevich has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update spin_wait block comment

Two MacOS tests failed due to time out. This is not related to my change.

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PR Comment: https://git.openjdk.org/jdk/pull/26072#issuecomment-3053162368