* dirsearch.cc (Dirsearch::initialize): Add all blockers before

	queueing any tasks.
	* gold.cc (queue_middle_gc_tasks): Likewise.  Fix final blocker.
	(queue_middle_tasks): Add all blockers before queueing any tasks.
	(queue_final_tasks): Likewise.
	* token.h (Task_token::add_blockers): New function.
	* object.h (Input_objects::number_of_relobjs): New function.