RFR: 8311902: Concurrency regression in the PBKDF2 key impl of SunJCE provider [v2]

[Valerie Peng]

> This change adds back the Reference.ReachabilityFence(Object) call removed by [JDK-8301553](https://bugs.openjdk.org/browse/JDK-8301553).
> 
> Please help review.
> Thanks!
> Valerie

Valerie Peng has updated the pull request incrementally with one additional commit since the last revision:

  Include more methods into the scope for consistency/correctness sake.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14859/files
  - new: https://git.openjdk.org/jdk/pull/14859/files/9d3c15a7..949f1891

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14859&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14859&range=00-01

  Stats: 52 lines in 1 file changed: 27 ins; 1 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/14859.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14859/head:pull/14859

PR: https://git.openjdk.org/jdk/pull/14859