Integrated: JDK-8294947: Use 64bit atomics in patch_verified_entry on x86_64

[Dmitry Samersoff]

On Wed, 9 Nov 2022 12:41:59 GMT, Dmitry Samersoff <dsamersoff at openjdk.org> wrote:

> In the void NativeJump::patch_verified_entry() we atomically patch first 4 bytes, then atomically patch 5th byte, then atomically patch first 4 bytes again. But from CMC (cross-modified code) point of view it's better to patch atomically 8 bytes at once.
> 
> The patch was tested with hotspot jtreg tests in bare-metal and virtualized environments.

This pull request has now been integrated.

Changeset: d0fae43e
Author:    Dmitry Samersoff <dsamersoff at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/d0fae43e89a73e9d73b074fa12276c43ba629278
Stats:     22 lines in 1 file changed: 19 ins; 3 del; 0 mod

8294947: Use 64bit atomics in patch_verified_entry on x86_64

Reviewed-by: kvn

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PR: https://git.openjdk.org/jdk/pull/11059