RFR: 8358537: (bf) JavaNioAccess::getBufferAddress bypasses direct buffer MemorySession state check [v2]

[Brian Burkhalter]

> Add package-scope `long java.nio.Buffer::address()` to simply return the value of the `address` instance variable; use this method in `JavaNioAccess::getBufferAddress`.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8358537: Revert MemorySegments test change

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25631/files
  - new: https://git.openjdk.org/jdk/pull/25631/files/7c2f0130..7e6c05ad

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25631&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25631&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25631.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25631/head:pull/25631

PR: https://git.openjdk.org/jdk/pull/25631