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Make _swift_dispatch_block_create_with_qos_class NS_RETURNS_RETAINED #19859

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aschwaighofer
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Otherwise, we return in the autorelease pool and this can keep the block
alive longer than a surrounding withoutActuallyEscaping expression
causing verification failures.

rdar://45226617
SR-8955

Otherwise, we return in the autorelease pool and this can keep the block
alive longer than a surrounding withoutActuallyEscaping expression
causing verification failures.

rdar://45226617
SR-8955
@aschwaighofer
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@swift-ci Please test

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