RFR: 8350666: cmp-baseline builds fail after JDK-8280682

[Ioi Lam]

On Tue, 25 Feb 2025 23:08:39 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> A fix for initializing the `_timestamp` field in `AOTClassLocation` properly so that the cmp-baseline builds are successful.
> 
> Sanity tested with builds-tier5.

BTW I think this qualifies as a trivial fix. It reverts back to the same behavior before JDK-8280682.

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PR Comment: https://git.openjdk.org/jdk/pull/23787#issuecomment-2683533424