when creating an AssociatedItem, read data from impl, not impl item

Before, when we created an AssociatedItem for impl item X, we would read
the impl item itself. Now we instead load up the impl I that contains X
and read the data from the `ImplItemRef` for X; actually, we do it for
all impl items in I pre-emptively.

This kills the last source of edges between a method X and a call to a
method Y defined in the same impl.

Fixes #37121

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