RFR: 8353192: C2: Clean up x86 backend after 32-bit x86 removal

[Aleksey Shipilev]

On Thu, 3 Apr 2025 17:25:25 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> I looked on `adlc` code to make sure nothing left there and found check for `IA32`. 

Right, ADLC should also be cleaned up a bit in this PR, purged a bit more.

> I surprise to see `X32` too which we check in `os_linux.cpp`.

Right. We are going to handle all these remaining leftovers with https://bugs.openjdk.org/browse/JDK-8351149, after we yank the major solid parts like this compiler backend support :)

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PR Comment: https://git.openjdk.org/jdk/pull/24300#issuecomment-2782496973