[concurrency] allow type initializers to be 'async' #35398
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There's a basic prolog emission function, used by value and class constructors, etc, and then there's the full-blown one for functions and closures, which uses the basic version.
implicit calls to an async super.init are not allowed
types correctly hop to the right global-actor in their prolog.
new phrasing in the error messages to match up with other phrasing used in messages.
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Earlier in the design of async/await, we disallowed async initializers for nominal types. There is no fundamental reason for the restriction and it was decided that async initializers would actually be useful (to allow initializers to invoke async functions, for example), and so they appear in the now accepted async/await proposal.
This PR fills in this missing part of the proposal, by allowing initializers to be async.
Resolves rdar://71049563
TODO: