[orc-rt] Add ResourceManager interface. The ResourceManager interface can be used to implement ownership for resources allocated to JIT'd code, e.g. memory and metadata registrations (frame info, language runtime metadata, etc.). Resources can be *deallocated*, meaning that they should be cleaned up (memory released, registrations deregistered, etc.), or they can be *detached*, meaning that cleanup should be performed automatically when the ResourceManager itself is destroyed. The intent is to allow JIT'd code to continue running after the llvm::orc::ExecutionSession that produced it is disconnected / destroyed.
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