RFR: 8361587: AssertionError in File.listFiles() when path is empty and -esa is enabled [v6]

[Brian Burkhalter]

> Changes to address `File.listFiles` invoked on an empty path. This fixes an oversight in #22821.

Brian Burkhalter has updated the pull request incrementally with two additional commits since the last revision:

 - 8361587: Address the error directly in listFiles
 - 8361587: Revert changes to File and UnixFileSyetem

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/26224/files
  - new: https://git.openjdk.org/jdk/pull/26224/files/91867701..93e61dc1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26224&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26224&range=04-05

  Stats: 11 lines in 2 files changed: 9 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26224.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26224/head:pull/26224

PR: https://git.openjdk.org/jdk/pull/26224