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

[Vladimir Kozlov]

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`

src/hotspot/cpu/x86/x86.ad line 2680:

> 2678:         break;
> 2679:       case Op_VecX:
> 2680: #ifndef _LP64

Here and in following code you left code for 32-bit instead of 64-bits.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/24300#discussion_r2027426985