Found while working on D108987. When interpreting VP nodes as
`MemSDNode` nodes, this function would return the incorrect indices.
This was due to `VP_GATHER` and having no "passthru", and both
`VP_GATHER` and `VP_SCATTER` having their mask operands *after* the base
pointer, unlike `MGATHER` and `MSCATTER`.
Reviewed By: craig.topper
Differential Revision: https://reviews.llvm.org/D109308
case ISD::STORE:
case ISD::VP_STORE:
case ISD::MSTORE:
+ case ISD::VP_SCATTER:
return getOperand(2);
case ISD::MGATHER:
case ISD::MSCATTER:
- case ISD::VP_GATHER:
- case ISD::VP_SCATTER:
return getOperand(3);
default:
return getOperand(1);