RFR: 8374945: Avoid fstat in os::open [v3]

[Jonas Norlinder]

> Eliminate unnecessary calls to fstat in os::open akin to JDK-8373647. This optimization reduces system overhead.

Jonas Norlinder has updated the pull request incrementally with one additional commit since the last revision:

  Fix typo in comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29152/files
  - new: https://git.openjdk.org/jdk/pull/29152/files/dfc44a6b..ffd76aaa

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29152&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29152&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29152.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29152/head:pull/29152

PR: https://git.openjdk.org/jdk/pull/29152