[crac] RFR: 8372863: [CRaC] Fix glibc IFUNC for AVX_Fast_Unaligned_Load [v5]

[Radim Vansa]

On Wed, 3 Dec 2025 18:59:04 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

>> glibc derives `AVX_Fast_Unaligned_Load` from CPU features but it is based on hardware CPU features and so disabling a CPU feature required for `AVX_Fast_Unaligned_Load` will not disable `AVX_Fast_Unaligned_Load` itself and it needs an explicit `GLIBC_TUNABLES` environment variable disabling.
>> 
>> There is a whole such category of 'preferred' bits. I hope no other bit causes crash (as they are there primarily for performance benefits) but that should be still verified.
>
> Jan Kratochvil has updated the pull request incrementally with one additional commit since the last revision:
> 
>   make AVX_Fast_Unaligned_Load lowercase as required

Marked as reviewed by rvansa (Committer).

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PR Review: https://git.openjdk.org/crac/pull/277#pullrequestreview-3550755363