We only want to save a `.crash` file if the input would cause a crash
when executing using the native harness. The old impl treated any state
termination as a crash. Now we add a predicate which checks the `reason`
and decides if the termination represents a crash in the program being
analyzed.
For now, we only flag `InvalidMemoryAccess` exceptions as crashes, as
identified by the `message` property on a `TerminateState` exception.
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