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

[Aleksey Shipilev]

On Fri, 28 Mar 2025 17:09:19 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Piece-wise cleanup of C2 x86 backend. C2_MacroAssembler, x86.ad and related files are the target for this cleanup. 
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `all`
>  - [x] Linux x86_64 server fastdebug, `all` + `-XX:-TieredCompilation`

This pull request has now been integrated.

Changeset: 250eb743
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/250eb743c112fbcc45bf2b3ded1c644b19893577
Stats:     493 lines in 6 files changed: 1 ins; 420 del; 72 mod

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

Reviewed-by: kvn, epeter

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PR: https://git.openjdk.org/jdk/pull/24300