[clang] [ItaniumCXXABI] Mark RTTI type name as global unnamed_addr (PR #111343)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

unnamed_addr doesn't allow cloning; there's no way to make it work in a reasonable way even if we wanted it.  See, for example, https://github.com/llvm/llvm-project/issues/32127 .

https://github.com/llvm/llvm-project/pull/111343