Convert exception during delayed autoload to fatal error

Same as with other exceptions during inheritance, convert those
thrown during delayed class loading into fatal errors. We can't

Convert exception during delayed autoload to fatal error

Same as with other exceptions during inheritance, convert those
thrown during delayed class loading into fatal errors. We can't
properly deal with such exceptions, as inheritance cannot be
gracefully aborted at this point.

Fixes oss-fuzz #39405.

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