KiokuDB::TypeMap::Resolver - Caching resolver for KiokuDB::TypeMap

This object is used by KiokuDB::Linker and KiokuDB::Collapser to map class names to collapsing/expanding method bodies.

Since KiokuDB::TypeMaps are fairly complex, and KiokuDB::TypeMap::Entry objects can benefit from specializing to a class by precomputing some things, resolution is performed once per class, and the results are cached in the resolver.