swift234

SILGen: Emit materializeForSet in more cases

Recently I changed Sema to always emit materializeForSet for properties
of structs, to fix issues with duplicate or missing symbols when the
type declaration and conformance are in different translation units.

The same issue can happen with properties of final classes and enums,
so let's simplify the logic by always emitting a materializeForSet
when possible.

The new multifile demonstrate the problem.