[jdk21u] RFR: 8295555: Primitive wrapper caches could be `@Stable`

[Aleksey Shipilev]

Clean backport to improve corner case performance around the primitives.

Additional testing:
 - [ ] Linux AArch64 server fastdebug, `tier1 tier2 tier3`

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

Commit messages:
 - Backport f7de726bd37a2f1fa6f63b601cd2dab1805234e8

Changes: https://git.openjdk.org/jdk21u/pull/286/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=286&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295555
  Stats: 16 lines in 5 files changed: 11 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk21u/pull/286.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/286/head:pull/286

PR: https://git.openjdk.org/jdk21u/pull/286