Keep order when creating nodes in EOGConceptPass

[konradweiss]

Currently, when creating nodes in an EOGConceptPass they are first added to a set and then later created via some pass specific internal mechanisms. This means that the order when creating multiple nodes in the pass and the order when they are actually created internally might differ, resulting in unexpected EOG results for example.

• Do we need to change more sets to ordered sets?
• Do we want to have this change?

(#2330 <- old PR)