Integrated: 8351157: Clean up x86 GC barriers after 32-bit x86 removal

[Aleksey Shipilev]

On Wed, 26 Mar 2025 12:48:13 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Assembler GC barriers have quite a bit of coding to support 32-bit x86. As 32-bit x86 is removed, we can clean up those parts.
> 
> We can eliminate `!LP64` blocks quite easily. We can also prune passing around `thread` argument, and just trust that `r15_thread` is always available.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `tier1`
>  - [x] Linux x86_64 server fastdebug, `all`

This pull request has now been integrated.

Changeset: 73c8c755
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/73c8c755ea638c09147d28080646ee8887ee8283
Stats:     543 lines in 20 files changed: 1 ins; 426 del; 116 mod

8351157: Clean up x86 GC barriers after 32-bit x86 removal

Reviewed-by: kbarrett, wkemper, tschatzl

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PR: https://git.openjdk.org/jdk/pull/24253