Merge #4674 to 'chrome' branch #4679
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It turns out that the same class can be used for different fuzzing rounds, and the parent directory of the temp dir is being cleared in between each round. For that reason, we need to re-create a workdir in `prepare`.
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centipede: create workdir in prepare instead of the constructor
It turns out that the same class can be used for different fuzzing rounds, and the parent directory of the temp dir is being cleared in between each round. For that reason, we need to re-create a workdir in prepare.