RFR: 8358236: [AOT] Graal crashes when trying to use persisted MDOs

[Vladimir Kozlov]

On Sun, 1 Jun 2025 19:01:27 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

> Forgot to null out MethodData::_failed_speculations before snapshotting. As a result it gets restored with a dangling pointer.
> Testing looks clean.

Trivial.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25570#pullrequestreview-2886119546