Mark Lacey 2008674495 Make ImplicitlyUnwrappedOptional<T> an unavailable typealias. ...

Also remove the decl from the known decls and remove a
bunch of code referencing that decl as well as a bunch of other
random things including deserialization support.

This includes removing some specialized diagnostics code that
matched the identifier ImplicitlyUnwrappedOptional, and tweaking
diagnostics for various modes and various issues.

Fixes most of rdar://problem/37121121, among other things.

2018-02-02 08:35:53 -08:00

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