Property descriptors for static properties were only recently introduced with
SE-438. Since these symbols are not present in Swift libraries that were
compiled with earlier versions of the compiler, it is not safe for
`#_hasSymbol` to check for the property descriptor symbols, since they can be
absent at either link time or runtime.
Resolves rdar://139749275.
Although I don't plan to bring over new assertions wholesale
into the current qualification branch, it's entirely possible
that various minor changes in main will use the new assertions;
having this basic support in the release branch will simplify that.
(This is why I'm adding the includes as a separate pass from
rewriting the individual assertions)
`ReadOnly`/`ArgMemOnly` were mostly moved over, but a few were missed.
Update them all. Also default to `unknown` for no memory effects rather
than none (ie. we should be conservative).
For each decl that needs a `#_hasSymbol()` query function, emit the corresponding helper function body during IRGen. Use `IRSymbolVisitor` to collect linkable symbols associated with the decl and return true from the helper function if the address of every associated symbol is non-null.
Resolves rdar://101884587
