RFR: 8301843: Remove dummy region allocation

[Thomas Schatzl]

Hi all,

  can I have reviews for this imo trivial removal of some debug code?

This code has never been used by me, and there are better ways imo to get the same effects - see the CR.

Testing: local compilation, gha

Thanks,
  Thomas

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Depends on: https://git.openjdk.org/jdk/pull/12360

Commit messages:
 - initial version

Changes: https://git.openjdk.org/jdk/pull/12433/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12433&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301843
  Stats: 41 lines in 3 files changed: 0 ins; 41 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/12433.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12433/head:pull/12433

PR: https://git.openjdk.org/jdk/pull/12433