[jdk21u] Integrated: 8316645: RISC-V: Remove dependency on libatomic by adding cmpxchg 1b

[Aleksey Shipilev]

On Mon, 6 Nov 2023 14:08:29 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport on the way to improve Atomic support in 21u.
> 
> Note @robehn ;)
> 
> Additional testing:
>  - [x] MacOS AArch64 server fastdebug, `gtest:Atomic`

This pull request has now been integrated.

Changeset: 50c34cad
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk21u/commit/50c34cad95222c0330b31327cdc5becf56f77f71
Stats:     124 lines in 3 files changed: 118 ins; 6 del; 0 mod

8316645: RISC-V: Remove dependency on libatomic by adding cmpxchg 1b
8317335: Build on windows fails after 8316645

Reviewed-by: rehn
Backport-of: fb055e7e5300958b2a6a290aa6783e8ede929d9a

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PR: https://git.openjdk.org/jdk21u/pull/325