Add pool_allocator for fibonaci heaps.

Add pool_allocator for fibonaci heaps.

	* fibonacci_heap.h (fibonacci_heap<K,V>::fibonacci_heap):
	Add allocator parameter.
	(fibonacci_heap<K,V>::~fibonacci_heap): Optimize destruction.
	(fibonacci_heap<K,V>::m_allocator): New.
	(fibonacci_heap<K,V>::m_own_allocator): New.
	(fibonacci_heap<K,V>::insert): Use allocator.
	(fibonacci_heap<K,V>::extract_min): Likewise.
	(fibonacci_heap<K,V>::union_with): Assert that both heaps share
	allocator.
	(fibonacci_heap<K,V>::consolidate): Allocate constant sized vector
	on stack.
	* fibonacci_heap.c: Include alloc-pool
	(test_empty_heap): Initialize allocator.
	(test_union): Likewise.
	* bb-reorder.c: Include alloc-pool.h.
	* tracer.c: Inlclude alloc-pool.h.

From-SVN: r278501