[jdk21u-dev] RFR: 8322166: Files.isReadable/isWritable/isExecutable expensive when file does not exist [v2]

[Todd V. Jonker]

> Clean backport of a performance fix, originally authored by @bplb and reviewed by @AlanBateman 
> 
> Test suites run on linux-x86_64-server-release:
> - [x] tier1
> - [x] jdk/java/nio

Todd V. Jonker has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into filecheck
 - Backport 51be857f3cafa23eb7cd73e5fe3db17e6d01684c

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/926/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/926/files/1fc5729d..ce2cef3f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=926&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=926&range=00-01

  Stats: 9420 lines in 193 files changed: 5602 ins; 3289 del; 529 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/926.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/926/head:pull/926

PR: https://git.openjdk.org/jdk21u-dev/pull/926