Only make the structure complex if there is an interface pointer, not
if there is a pointer to a union or complex struct since these are
handled perfectly well by the pointer marshalling code.

Fix the detection of structures with ref-pointers or pointers in 64-bit code.

Also fills a 3 byte hole.

Also happens to fill two 3 byte holes.

Most callers work on a stateblock rather than a device, and the main fields
we check (vertexShader and pixelShader) are part of the stateblock as well.

Add explicit padding fields in the corresponding structures.