Start of an llvm.coro.async implementation
This patch adds the async lowering of coroutines.
This will be used by the Swift frontend to lower async functions. In
contrast to the retcon lowering the frontend needs to be in control
over control-flow at suspend points as execution might be suspended at
This is very much work in progress and the implementation will change as
it evolves with the frontend. As such the documentation is lacking
detail as some of it might change.
Reapply with fix for memory sanitizer failure and sphinx failure.
Differential Revision: https://reviews.llvm.org/D90612