RFR: 8373122: JFR build failure with CDS disabled due to -Werror=unused-function after JDK-8365400

[Francesco Andreuzzi]

On Fri, 19 Dec 2025 06:43:05 GMT, Hao Sun <haosun at openjdk.org> wrote:

> `get_source(const AOTClassLocation* cl, JavaThread* jt)` is only used by `JfrClassDefineEvent::on_restoration()` within an `INCLUDE_CDS` guard.
> 
> Add the same `INCLUDE_CDS` guard to mitigate the GCC warning.
> 
> Tests: JDK build with CDS disabled passed on both x86_64 and aarch64.
>        tier1~3 passed on both x86_64 and aarch64.

Marked as reviewed by fandreuzzi (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/28917#pullrequestreview-3597965372