Kevin Ballard 2530957bc6 Use shims for all calls to Dispatch APIs that take blocks ...

This ensures that blocks that come from `DispatchWorkItem`s will
function correctly.

The only exception is __dispatch_barrier_sync() as the block passed to
that call is not `@convention(block)` so it doesn't matter.

Fixes SR-2246.

2016-08-01 17:08:14 -07:00

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