RFR: 8351194: Clean up Hotspot SA after 32-bit x86 removal [v8]

[Chris Plummer]

On Thu, 30 Oct 2025 11:43:26 GMT, Kerem Kat <krk at openjdk.org> wrote:

>> Remove 32-bit x86 specific code from the HotSpot Serviceability Agent following the removal of 32-bit x86 support.
>> 
>> - Removed x86-specific implementations and ifdef blocks.
>> - Renamed files with X86 in the name when they are also used from AMD64, e.g. `X86Frame` → `AMD64Frame`.
>> - Cleaned up platform detection logic in `PlatformInfo`.
>> - Updated documentation references.
>
> Kerem Kat has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Erase obsolete comments

Marked as reviewed by cjplummer (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27844#pullrequestreview-3400135642