RFR: 8338474: Parallel: Deprecate and obsolete PSChunkLargeArrays

[Albert Mingkun Yang]

Deprecating `PSChunkLargeArrays`, which is used only by Parallel and it is enabled by default.

Disabling it offers little benefit, so removing it do reduce the number of commandline flags.

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Commit messages:
 - pgc-deprecate

Changes: https://git.openjdk.org/jdk/pull/25997/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25997&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338474
  Stats: 2 lines in 2 files changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25997.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25997/head:pull/25997

PR: https://git.openjdk.org/jdk/pull/25997