Add Drop::poll_drop_ready for asynchronous destructors#2958

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withoutboats wants to merge 3 commits intorust-lang:masterfrom

withoutboats:poll-drop-ready

Commits on Jul 17, 2020

poll-drop-ready

Without Boats
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withoutboats
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clarify comment about burden
withoutboats
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Update text/0000-poll-drop-ready.md

withoutboats
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kennytm
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