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a2b77d09d7
Make `def_path_hash_to_def_id` not panic when passed an invalid hash I'm using this function in a third-party application (Creusot) to access private items (by reverse engineering their hash). This works in the happy path, but it panics when an item does not exist. There is no way to hack it downstream because the hook `def_path_hash_to_def_id_extern` must always return a `DefId` and its implementation uses `def_path_hash_to_def_index` which is internal and which is where the panic happens.
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