RFR: 8350869: os::stat doesn't follow symlinks on Windows

[Anton Artemov]

This PR addresses an issue on Windows, where a class file could not be loaded by a symbolic link. 

I added a check if a wide path is a symbolic link (soft one) and a method for dereferencing. Both os::stat() and os::open() on Windows now can handle such links.

Tested in tiers 1-3. A separate test added.

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Commit messages:
 - 8350869: Fixed whitespaces
 - 8350869: Added releasing of handles
 - Merge remote-tracking branch 'origin/master' into JDK-8350869
 - 8350869: More work on test.
 - Merge remote-tracking branch 'origin/master' into JDK-8350869
 - 8350869: More work
 - 8350869: Added handling of symlink on windows when loading a class.

Changes: https://git.openjdk.org/jdk/pull/25233/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25233&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350869
  Stats: 176 lines in 2 files changed: 174 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25233.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25233/head:pull/25233

PR: https://git.openjdk.org/jdk/pull/25233