Alexis Laferrière 6c6cd41afd [Serialization] Public overrides of internal decls are ignorable by clients ...

This change reflects the behavior of `DeclAttribute.printImpl` that
prints the `override` keyword in a swiftinterface only when the
overriden decl is also public.

This issue was detected when working on deserialization safety by public
overrides of private functions in the following tests:

test/Interpreter/vtables_multifile.swift
test/Interpreter/vtables_multifile_testable.swift
test/SILGen/accessibility_vtables_testable.swift
test/SILGen/accessibility_vtables_usableFromInline.swift
test/SILGen/vtables_multifile.swift

2023-01-17 09:39:59 -08:00

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