RFR: 8353197: Document preconditions for JavaLangAccess methods [v3]

[Volkan Yazici]

> Document preconditions on certain `JavaLangAccess` methods that use operations either unsafe and/or without range checks.

Volkan Yazici has updated the pull request incrementally with one additional commit since the last revision:

  Prefix touched methods with `unchecked`

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24982/files
  - new: https://git.openjdk.org/jdk/pull/24982/files/f0623258..4d237efa

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24982&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24982&range=01-02

  Stats: 66 lines in 21 files changed: 0 ins; 3 del; 63 mod
  Patch: https://git.openjdk.org/jdk/pull/24982.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24982/head:pull/24982

PR: https://git.openjdk.org/jdk/pull/24982