PR lto/63968

        * bb-reorder.c (find_traces_1_round): decreate_key is replaced
	with replace_key method.
	* fibonacci_heap.h (fibonacci_heap::insert): New argument.
	(fibonacci_heap::replace_key_data): Likewise.
	(fibonacci_heap::replace_key): New method that can even increment key,
	this operation costs O(log N).
	(fibonacci_heap::extract_min): New argument.
	(fibonacci_heap::delete_node): Likewise.

From-SVN: r218006