lima/gpir: Don't emit movs when translating from NIR

lima/gpir: Don't emit movs when translating from NIR

The scheduler doesn't expect them. To do this, I had to refactor the
registration part of gpir_node_create_dest() to be separate from
creating and inserting the node, since the last two now aren't done when
handling moves. This adds more code but creates the possibility of
automatically inserting input dependencies when inserting nodes, similar
to what's done in NIR with the use-def lists (this isn't done yet).

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>