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readPrefixes() assumes insn->bytes is non-empty. The code path is not exercised in llvm-mc because llvm-mc does not feed empty input to MCDisassembler::getInstruction(). This bug is uncovered by a5994c789a2982a770254ae1607b5b4cb641f73c. An empty string did not crash before because the deleted regionReader() allowed UINT64_C(-1) as insn->readerCursor. Bytes.size() <= Address -> R->Base 0 <= UINT64_C(-1) - UINT32_C(-1)