8387257: (coll) add fast path for PriorityQueue.addAll(Collection)

[PeyaPeyaPeyang]

Added a fast path for PriorityQueue#addAll when adding elements to an empty, exact PriorityQueue instance.

Instead of inserting each element one by one through AbstractQueue#addAll,
the implementation now copies the source collection into the backing array and calls heapify().
This reduces the construction cost for bulk insertion into an empty queue from repeated per-element sift-up work to linear-time heap construction.

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• JDK-8387257: (coll) add fast path for PriorityQueue.addAll(Collection) (Enhancement - P4)

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