1398661 extracted the code for getting a location from an annotation
into a separate module. However that function expects an Annotation but
the sort predicate function was being passed a Thread.

Consequently the predicate function was returning
Number.POSITIVE_INFINITY for every thread and so sort ordering fell back
to the default 'tie-breaker' comparator - which is the original index of
the element in the list being sorted.

Fixes #3106