Kavon Farvardin ee819c80a9 Build support for ~Copyable atop @_moveOnly ...

We parse `~Copyable` in an inheritance clause of enum and
struct decls as a synonym for the `@_moveOnly` attribute
being added to that decl. This completely side-steps the
additional infrastructure for generalized suppressed
conformances in favor of a minimal solution. One benefit of
this minimal solution is that it doesn't risk introducing
any back-compat issues with older compilers or stdlibs.

The trade-off is that we're more committed to supporting
`@_moveOnly` in compiled modules in the future. In fact,
this change does not deprecate `@_moveOnly` in any way.

resolves rdar://106775103

2023-05-01 14:36:39 -07:00

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