RFR: 8339783: Implementation of JEP 479: Remove the Windows 32-bit x86 Port

[Julian Waters]

On Mon, 28 Oct 2024 19:25:09 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> This is the implementation of [JEP 479: _Remove the Windows 32-bit x86 Port_](https://openjdk.org/jeps/479).
>> 
>> This is the summary of JEP 479:
>>> Remove the source code and build support for the Windows 32-bit x86 port. This port was [deprecated for removal in JDK 21](https://openjdk.org/jeps/449) with the express intent to remove it in a future release.
>
> src/hotspot/os_cpu/windows_x86/os_windows_x86.cpp line 523:
> 
>> 521: 
>> 522: extern "C" int SpinPause () {
>> 523: #ifdef AMD64
> 
> Weird that SpinPause is not implemented on Win64, but oh well. This whole SpinPause mess should be arch-specific, not OS/Arch specific, probably.

@shipilev There _is_ a way to implement SpinPause on Windows/x64 though, if support is really as simple as a single pause instruction. Should I help implement this separately (After this PR is integrated, to avoid conflicts)? Although, the way SpinPause can be implemented is honestly so simple and trivial that @magicus could simply replace the entire body of this SpinPause with it in this PR

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PR Review Comment: https://git.openjdk.org/jdk/pull/21744#discussion_r1820797875