RFR: 8374945: Avoid fstat in os::open [v2]

[Johan Sjölen]

On Wed, 14 Jan 2026 15:37:15 GMT, Jonas Norlinder <jnorlinder at openjdk.org> wrote:

>> Eliminate unnecessary calls to fstat in os::open akin to JDK-8373647. This optimization reduces system overhead.
>
> Jonas Norlinder has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Fixes
>  - Remove trailing whitespace
>  - [Linux] Avoid fstat in os::open

Marked as reviewed by jsjolen (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29152#pullrequestreview-3666503486