[clang] Polymorphic Cleanup type is moved despite not being POD types (#156607) Clang as a number of Cleanup types used in exception handling, these are presumed to be POD types that can be memmoved as needed, however this is not correct by default on platforms with pointer authentication that make vtable pointers address discriminated. This PR mitigates this problem by introducing a LLVM_MOVABLE_POLYMORPHIC_TYPE macro that can be used to annotate polymorphic types that are required to be movable, to override the use of address discrimination of the vtable pointer.
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