Created by: khuey
The mask register is always the first source operand. i here is stale, the result of previous loop. The instr_get_src correctly uses a hardcoded zero. But instr_info_opnd_type reuses i and dies if the instruction has a single source operand (because i is always out of range). is_evex_mask_pending is not ever set for Intel style disassembly which is why this bug only affects AT&T syntax.
drdisas -syntax att 62 f2 fe 48 28 c9 will trigger this bug.
This is tested in the (currently ifdefed out) binutils AVX-512 tests.
Fixes #4567 (closed)