RFR: 8350753: Deprecate UseCompressedClassPointers

[Thomas Stuefe]

Deprecates UseCompressedClassPointers. For the lengthy description of why and how we do this, please read the lengthy [CSR](https://bugs.openjdk.org/browse/JDK-8350754).

Testing:

I ran all jtreg tests manually on Linux-x64 that used the flag in some form (55 tests) to ensure they don't trip over the added deprecation output.

I also tested the JVM on arm32 to verify that UseCompressedClassPointers had never been available there, and that we don't start printing a confusing deprecation message now.

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Commit messages:
 - not on 32-bit
 - Deprecate UseCompressedClassPointers

Changes: https://git.openjdk.org/jdk/pull/24436/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24436&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350753
  Stats: 8 lines in 3 files changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24436.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24436/head:pull/24436

PR: https://git.openjdk.org/jdk/pull/24436