RFR: 8340010: Fix vectorization tests with compact headers [v2]

[Emanuel Peter]

On Mon, 25 Nov 2024 07:31:03 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   make failOf comment explicit for Roberto
>
> Still good!

@chhagedorn @rkennke @robcasloz @Hamlin-Li thanks for looking at this!

I ran another offline merge and test - looks good.

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PR Comment: https://git.openjdk.org/jdk/pull/22199#issuecomment-2497630175