RFR: 8366272: The os::xxx APIs do not manage errno correctly [v2]

[Anton Artemov]

> Hi, please consider the following changes:
> 
> In this PR the handling of `errno` is improved by inspection of the codebase and fixing potential overwrites of `errno` by other methods. Potential overwrites are addressed using `ErrnoPreserver` functionality where necessary. 
> 
> Tested in tiers 1 - 5.

Anton Artemov 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 two additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master' into JDK-8366272-the-os-xxx-api-do-not-manage-errno-correctly
 - 8366272: Improved errno management in os:xxx methods

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28086/files
  - new: https://git.openjdk.org/jdk/pull/28086/files/f3ab0677..e40afdb2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28086&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28086&range=00-01

  Stats: 275195 lines in 2669 files changed: 185212 ins; 49712 del; 40271 mod
  Patch: https://git.openjdk.org/jdk/pull/28086.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28086/head:pull/28086

PR: https://git.openjdk.org/jdk/pull/28086