RFR: 8304591: (fs) UnixPath.stringValue need not be volatile [v2]

[Sergey Tsypanov]

> `UnixPath.stringValue` can be computed by multiple threads safely as the actual value is the same, so the race is benign in this case.

Sergey Tsypanov has updated the pull request incrementally with one additional commit since the last revision:

  Revert

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13115/files
  - new: https://git.openjdk.org/jdk/pull/13115/files/2cc5ee57..88cd6cfc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13115&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13115&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13115.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13115/head:pull/13115

PR: https://git.openjdk.org/jdk/pull/13115