The LLVM AsmParser showed different behavior compared to GAS when
parsing address operands in the following two ways:
- If the address operand only has a single register (no comma),
it is always interpreted as base register by GAS, even in the
vector-index case (vgef etc.) This means the following is
actually incorrect usage, as the base cannot be a vector
register: vgef %v0, 0(%v1), 0.
- GAS allows specifying a missing base register by using a
comma after the first register, e.g. vgef %v0, 0(%v1,), 0.
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