RFR: 8351149: Remove dead IA32/X32/!AMD64 code blocks after 32-bit x86 removal

[Anton Seoane Ampudia]

On Mon, 27 Oct 2025 09:19:24 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> This PR carries out cleanup of `IA32`-, `X32`- and `!AMD64`-guarded code blocks after the removal of the 32-bit x86 architecture from HotSpot.
>> 
>> These code blocks are either not needed anymore or the guards redundant.
>> 
>> Please note that this changeset addresses the "complement" of [JDK-8351159](https://github.com/openjdk/jdk/pull/27987). This is to say, this PR targets all directories that are *not* `cpu/x86` and `os_cpu/x86`.
>> 
>> **Testing:** passes tiers 1-3
>
> src/hotspot/os/linux/os_linux.cpp line 3097:
> 
>> 3095:   vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu);
>> 3096:   retval = vgetcpu(&cpu, nullptr, nullptr);
>> 3097: #endif
> 
> Should this really have been removed?

It really shouldn't have. Fixed it

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PR Review Comment: https://git.openjdk.org/jdk/pull/27990#discussion_r2468603246