RFR: 8350549: MethodHandleProxies.WRAPPER_TYPES is not thread-safe [v3]

[Chen Liang]

> Use a thread-safe ReferencedKeySet instead of a WeakHashMap key set.

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  Review suggestions

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23757/files
  - new: https://git.openjdk.org/jdk/pull/23757/files/60404635..eb405dd9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23757&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23757&range=01-02

  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23757.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23757/head:pull/23757

PR: https://git.openjdk.org/jdk/pull/23757