RFR: 8171221: Remove -XX:+CheckMemoryInitialization

[Thomas Schatzl]

Hi all,

  please review this change that removes the broken (verified) -XX:+CheckMemoryInitialization debug flag. Interestingly there are some test cases that explicitly check this functionality without problems, but they are simply not thorough enough.

Apparently this has been broken since at least 2016, and given that nobody cared to fix it since then I think it's not worth trying to salvage it here either.

Testing: local compilation, gha

Thanks,
  Thomas

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Commit messages:
 - cleanup
 - remove tests too
 - Remove flag

Changes: https://git.openjdk.org/jdk/pull/14101/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14101&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8171221
  Stats: 125 lines in 6 files changed: 0 ins; 125 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14101.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14101/head:pull/14101

PR: https://git.openjdk.org/jdk/pull/14101