[jdk25u] RFR: 8343218: Add option to disable allocating interface and abstract classes in non-class metaspace

[Coleen Phillimore]

This is a clean backport of the addition of a diagnostic option to turn off the optimization of storing interface and abstract classes in non-class metaspace in case some customer hits some c2 bug.  We may also decide to backport to JDK 25 removing this optimization completely.

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Commit messages:
 - Backport da3a5da81bc1d6fe1e47e3a4e65bf390ee1d39a0

Changes: https://git.openjdk.org/jdk25u/pull/123/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=123&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343218
  Stats: 12 lines in 5 files changed: 6 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk25u/pull/123.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/123/head:pull/123

PR: https://git.openjdk.org/jdk25u/pull/123