These are tests that fail in the next commit without this flag. This
does not add -verify-ignore-unrelated to all tests with -verify, only
the ones that would fail without it. This is NFC since this flag is
currently a no-op.
Suggesting the addition of an `@available` attribute on Linux and Windows is
inapprorpriate given that Swift is not ABI stable on those platforms.
Resolves rdar://107387133