RFR: 8365823: Revert storing abstract and interface Klasses to non-class metaspace [v2]

[Coleen Phillimore]

> This change removes the optimization to not store abstract and interface Klass metadata to non-class metaspace.  Now all Klass metadata is in the Klass metaspace.  This is simpler and less bug prone, and didn't help with the limitation of classes that can be stored in class metaspace materially.
> Tested with tier1-4.

Coleen Phillimore has updated the pull request incrementally with three additional commits since the last revision:

 - Update src/hotspot/share/memory/metaspace.cpp
   
   Co-authored-by: Aleksey Shipilëv <shipilev at amazon.de>
 - Update src/hotspot/share/memory/metaspace.cpp
   
   Co-authored-by: Aleksey Shipilëv <shipilev at amazon.de>
 - Restore comment.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/27295/files
  - new: https://git.openjdk.org/jdk/pull/27295/files/864e938d..097c6b33

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27295&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27295&range=00-01

  Stats: 4 lines in 2 files changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27295.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27295/head:pull/27295

PR: https://git.openjdk.org/jdk/pull/27295