RFR: 8154364: (fs) Files.isSameFile() throws NoSuchFileException with broken symbolic links [v10]

[Brian Burkhalter]

> This request proposes to broaden the definition of which paths are considered to be the same by `java.nio.file.Files.isSameFile()`. A new test is added to cover many comparisons.

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

  8154364: Suggested change for key comparison

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26736/files
  - new: https://git.openjdk.org/jdk/pull/26736/files/b2bd8f2f..78f272bb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26736&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26736&range=08-09

  Stats: 21 lines in 1 file changed: 0 ins; 5 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/26736.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26736/head:pull/26736

PR: https://git.openjdk.org/jdk/pull/26736