Add a method for checking if the From and To addresses in a move
statement are only changing the indexes of modules relative to the
statement module.

This is needed because move statement nested within the module will be
able to match against both the From and To addresses, causing cycles in
the order of move operations.

Implied moves in nested modules were being skipped

Changing only the index on a nested module will cause all nested moves
to create cycles, since their full addresses will match both the From
and To addresses. When building the dependency graph, check if the
parent is only changing the index of the containing module, and prevent
the backwards edge for the move.