We can remove `GCCause::_no_cause_specified` and need to add a case for `_shenandoah_humongous_allocation_failure` in `GCCause::to_string`. We are also missing `_shenandoah_humongous_allocation_failure` in the `SA` analog.
------------- Commit messages: - Fix typo - Clean up/fix gc causes for Shenandoah Changes: https://git.openjdk.org/jdk/pull/25789/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25789&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8359394 Stats: 18 lines in 5 files changed: 5 ins; 6 del; 7 mod Patch: https://git.openjdk.org/jdk/pull/25789.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/25789/head:pull/25789 PR: https://git.openjdk.org/jdk/pull/25789
