RFR: 8325194: GHA: Add macOS M1 testing [v4]

[George Adams]

On Sat, 3 Feb 2024 21:45:27 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> George Adams has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   update copyright headers
>
> .github/actions/get-jtreg/action.yml line 66:
> 
>> 64:         fi
>> 65:         # Build JTReg and move files to the proper locations
>> 66:         bash make/build.sh --jdk "$JDK"
> 
> We did this `JAVA_HOME_17_X64` change for https://github.com/openjdk/jdk/commit/959a61fdd483c9523764b9ba0972f59ca06db0ee, which is partially reverted during upgrade of GH actions. (...and I forgot to revert this hunk, apparently.) I wonder if it would be simpler if we switch back to boot JDK for building jtreg again, which would eliminate this hunk? Might make backports easier too. 
> 
> I have no strong opinion here, though.

yeah this does make sense, anything to remove a horrible if statement 👍🏼

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PR Review Comment: https://git.openjdk.org/jdk/pull/17694#discussion_r1477131017