Simplify ReorderGlobals using new topological sort utils (#6885)

Use the new TopologicalSort and MinTopologicalSortOf utilities instead
of the old CRTP topological sort utility and a bespoke heap-based
topological sort in ReorderGlobals. Since there is no longer a heap to
pop from, the direction of the custom comparator is now much more
intuitive.

Further simplify the code by switching from tracking the new order of
globals using a sequence of new indices to tracking the order using a
sequence of old indices.

This change also makes the pass about 20% faster on a large real-world
module.

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