RFR: 8351970: Retire JavaLangAccess::exit

[Roger Riggs]

Cleanup the single use of JavaLangAccess.exit() it is no longer necessary; System.exit() can be called directly.

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

Commit messages:
 - 8351970: Retire JavaLangAccess::exit

Changes: https://git.openjdk.org/jdk/pull/24066/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24066&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351970
  Stats: 13 lines in 3 files changed: 0 ins; 12 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/24066.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24066/head:pull/24066

PR: https://git.openjdk.org/jdk/pull/24066