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Fix T86875: "Show on Cage" crash for geometry nodes primitives

Without `calc_object_remap` turned off in the conversion to and from
BMesh for the primitive nodes, the `CD_ORIGINDEX` custom data layer
has incorrect values. By using a different function to do the conversions,
we can avoid this problem.

Thanks to Jacques for finding the fix here.

Differential Revision: https://developer.blender.org/D10805