* pt.c (struct spec_entry): New type.
	(decl_specializations, type_specializations): New hash tables.
	(register_specialization, retrieve_specialization): Use them.
	(reregister_specialization, lookup_template_class): Use them.
	(eq_specializations, hash_tmpl_and_args, hash_specialization): New.
	(iterative_hash_template_arg): New.
	(init_template_processing): New
	(process_partial_specialization): Don't look to see if we already
	have this partial specialization.
	(maybe_process_partial_specialization): Handle reassigning
	full specializations when we get an explicit specialization
	of the partial instantiation.
	(tsubst_friend_function): Adjust specialization reassignment code.
	(instantiate_template): Only do one lookup.
	(instantiate_decl): Don't do any lookup.
	* cp-tree.h: Declare init_template_processing.
	* decl.c (duplicate_decls): Pass args to reregister_specialization.

From-SVN: r149188