RFR: 8350753: Deprecate UseCompressedClassPointers [v6]

[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.

Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:

  fix whitespaces

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24436/files
  - new: https://git.openjdk.org/jdk/pull/24436/files/1ee16bfe..61cf5b19

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24436&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24436&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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