RFR: 8327288: Obsolete the unused ProcessDistributionStride product option

[Thomas Schatzl]

Hi all,

  please review the obsoletion of the unused `ProcessDistributionStride` option. It controlled how threads were distributed across "boards" on Solaris. Solaris support has been removed in JDK 15, so this option is not needed/used either.

Testing: local compilation, grepping sources, testing the option to give the expected warning message

Thanks,
  Thomas

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Depends on: https://git.openjdk.org/jdk/pull/18118

Commit messages:
 - 8327288

Changes: https://git.openjdk.org/jdk/pull/18119/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18119&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327288
  Stats: 5 lines in 2 files changed: 1 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18119.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18119/head:pull/18119

PR: https://git.openjdk.org/jdk/pull/18119