RFR: 8354215: Clean up Loom support after 32-bit x86 removal [v2]

[Coleen Phillimore]

On Fri, 11 Apr 2025 11:46:07 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Small cleanup, we do not need this code anymore. This effectively reverts [JDK-8288040](https://bugs.openjdk.org/browse/JDK-8288040).
>> 
>> Additional testing:
>>  - [ ] GHA
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Touchups

Yeah that looks a lot better.  thanks!

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Marked as reviewed by coleenp (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24591#pullrequestreview-2760087195