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[5.1] Use the remaining half bit in the refcount to bypass ObjC deallocation overhead #25613

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[5.1] Use the remaining half bit in the refcount to bypass ObjC deallocation overhead #25613

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Catfish-Man
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(cherry picked from commit c512946)

5.1 cherry pick of #25418

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Revert "Revert "Use the remaining half bit in the refcount to bypass …
70f93f3 
…ObjC deallocation overhead""

And add availability checking for back deployment

This reverts commit 817ea12.

(cherry picked from commit c512946)
@Catfish-Man Catfish-Man requested a review from mikeash June 19, 2019 19:19
@Catfish-Man Catfish-Man self-assigned this Jun 19, 2019
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@swift-ci please test

@Catfish-Man Catfish-Man changed the title [5.1b3] Use the remaining half bit in the refcount to bypass ObjC deallocation overhead [5.1] Use the remaining half bit in the refcount to bypass ObjC deallocation overhead Jun 19, 2019
@Catfish-Man Catfish-Man deleted the no-objc-complications-5_1b3 branch June 19, 2019 19:29
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Build failed
Swift Test OS X Platform
Git Sha - 70f93f3

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Build failed
Swift Test Linux Platform
Git Sha - 70f93f3

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@mikeash mikeash Awaiting requested review from mikeash

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