RFR: 8341451: Remove C2HandleAnonOMOwnerStub

Thu Oct 3 07:16:04 UTC 2024

[JDK-8319796](https://bugs.openjdk.org/browse/JDK-8319796) has been implemented on all platforms which had previous C2 implementations of LM_LIGHTWEIGHT that made use of C2HandleAnonOMOwnerStub.

The declaration is still left in the shared code, an a couple of platforms have the definitions still lingering. I propose we remove them.

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Commit messages:
 - 8341451: Remove C2HandleAnonOMOwnerStub

Changes: https://git.openjdk.org/jdk/pull/21319/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21319&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341451
  Stats: 70 lines in 3 files changed: 0 ins; 70 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21319.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21319/head:pull/21319

PR: https://git.openjdk.org/jdk/pull/21319