Current data structure is using a hash of unordered lists. Those
unordered lists are quite efficient, because the least recently
inserted entries are most likely to used again. In order to avoid
long search times in other cases, the lists are hashed in to many
buckets. Unfortunatly a search for a miss needs an exhaustive
inspection and a careful definition of the hash.

Splay trees offer a similar feature (almost O(1) for access of the
least recently used entries), and amortized O(ln(n)) for almost all
other cases. Get rid of the hash.

Depends on D30516