Allan Shortlidge be70c568cb Frontend: Deprecate -warn-on-potentially-unavailable-enum-case option. ...

When `-warn-on-potentially-unavailable-enum-case` was introduced, the build
system was required to invoke `swift-frontend` at artificially low deployment
targets when emitting `.swiftinterface` files for legacy architectures. Because
the deployment target was low, some availability diagnostics needed to be
de-fanged in order to allow module interface emission to succeed. Today, the
build system is able to use the correct deployment target when emitting module
interfaces and the `-warn-on-potentially-unavailable-enum-case` is superfluous,
so deprecate it.

Resolves rdar://114092047

2023-08-18 10:02:39 -07:00

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