[orc-rt] Add StandaloneMachOUnwindInfoRegistrar. (#206669) StandaloneMachOUnwindInfoRegistrar provides methods and SPS-CI allocation actions for registering and deregistering MachO unwind-info sections (DWARF EH-frame and compact-unwind) via libunwind's find-dynamic-unwind-sections APIs. A Registration handle returned by enable() represents the connection with libunwind; clients must keep it alive for the lifetime of their Session, and its destructor releases the registration. Concurrent registrations are reference-counted so multiple sessions can share a single underlying libunwind hook. Registered code ranges are stored in an interval map. Overlapping ranges are rejected; lookups for an address outside any registered range return no info, so libunwind falls back to its other lookup mechanisms safely. A future MachO-Platform will provide integrated unwind-info registration and should be preferred when available. This class will then remain appropriate for MachO executors that deliberately omit the full platform. Unit tests cover the UnwindInfoMap storage layer (register/deregister/lookup, overlap rejection, edge cases). The libunwind-facing layer — enable(), the Registration RAII, and the find-dynamic-unwind-sections callback — is left to regression tests, which will become possible in the near future (once initial ControllerAccess implementations land).
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