These 3 tests have dialect-based conditionals, but weren't running Clang with enough different dialects to actually enable those conditional sections.
I would've assumed these conditionals were added by Sony folks for their change in default dialect - that doesn't necessarily mean these tests are needed upstream (the functionality may be tested elsewhere)
For two of the files, the conditionals were added by Richard Smith, not Sony. For the Sony case, it is the *older* path that was upstream originally, and that is the one that the tests stopped testing; there is no reason to think those paths are tested elsewhere.
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I don't think so; -Wno-c++11-extensions will not suppress diagnostics about GNU extensions. I think GNU++98 is what's wanted here (and is the old default dialect).