RFR: 8365626: (fs) Improve handling of broken links in Files.isSameFile() (win) [v9]

[Brian Burkhalter]

> Improve handling of broken symbolic links in `Files.isSameFile` on Windows as was done on Unix by the fix of [JDK-8154364](https://bugs.openjdk.org/browse/JDK-8154364).

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8365626: Further cleanup

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27079/files
  - new: https://git.openjdk.org/jdk/pull/27079/files/d3dd257f..b30f91f2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27079&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27079&range=07-08

  Stats: 73 lines in 1 file changed: 36 ins; 25 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/27079.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27079/head:pull/27079

PR: https://git.openjdk.org/jdk/pull/27079