RFR: 8351152: x86: Remove code blocks that handle UseSSE < 2 [v3]

[Vladimir Ivanov]

On Thu, 10 Apr 2025 08:26:51 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> 32-bit x86 was the platform that supported `UseSSE < 2`. 64-bit x86 baselines on `UseSSE >= 2`: https://github.com/openjdk/jdk/blob/567c6885a377e5641deef9cd3498f79c5346cd6a/src/hotspot/cpu/x86/vm_version_x86.cpp#L895-L902
>> 
>> After 32-bit x86 code is gone, we can remove all code blocks that are there to support `UseSSE < 2`.
>> 
>> Additional testing:
>>  - [x] Linux x86_64 server fastdebug, `all`
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:
> 
>  - Merge branch 'master' into JDK-8351152-x86-sse2-everywhere
>  - Also purge vestigial calls to VMVersion::supports_sse{2}
>  - Also 24-bit removals
>  - Touchups
>  - Fix

Looks good.

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Marked as reviewed by vlivanov (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24484#pullrequestreview-2758733519