RFR: 8339341: SurfaceManager cacheMap retains strong references [v2]

[Nikita Gubarkov]

> I moved SurfaceDataProxy cache into a separate class.
> Now caching level is determined by placement of the SurfaceManager.ProxyCache object instead of a "proxy key". This cache "owns" proxies and therefore strong refs via them do not prevent the cache and GraphicsConfig from being detected as weakly reachable.

Nikita Gubarkov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  8339341: Make SurfaceDataProxy cache a separate entity.
  
  Now caching level is determined by placement of the SurfaceManager.ProxyCache object instead of a "proxy key". This cache "owns" proxies and therefore strong refs via them do not prevent the cache (and hence GraphicsConfig) from being detected as weakly reachable.

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Changes: https://git.openjdk.org/jdk/pull/20825/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20825&range=01
  Stats: 173 lines in 17 files changed: 55 ins; 55 del; 63 mod
  Patch: https://git.openjdk.org/jdk/pull/20825.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20825/head:pull/20825

PR: https://git.openjdk.org/jdk/pull/20825